Protein Banana Coffee Cake

This high protein banana coffee cake packs 14 grams of protein per slice while tasting like the kind of comfort food you would never suspect is actually good for your goals. It takes basic ingredients like bananas, Greek yogurt, and vanilla protein powder and turns them into something that feels way more indulgent than a weekday breakfast should be. The coffee spiced crumb topping is the kind of detail that makes this one worth making on a Saturday morning.

Why I Keep Making This

• The mashed bananas create a naturally thick base that oat flour and protein powder build on, giving you a dense, tender crumb that actually tastes like coffee cake instead of a protein bar.
• Greek yogurt keeps the whole thing moist through baking while adding roughly 14 grams of protein per half cup without any tang you can taste once the cinnamon and banana come through.
• A touch of espresso powder in the cake batter deepens the cinnamon and nutmeg flavors in a way that makes it taste more complicated than the five bowl steps it actually takes.
• The coffee spiced crumb topping gives you that classic coffee cake experience with oat flour, walnuts, and just enough sweetener to keep things lean.

Ingredients

• Vanilla Protein Powder. One scoop here gets you close to 25 grams of protein before anything else is added. Vanilla pairs well with the banana and cinnamon without needing extra sweetener.
• Bananas. Three medium bananas mashed into the base is what gives this cake its natural sweetness and dense texture. Leave a few small chunks in for better mouthfeel.
• Greek yogurt. The primary ingredient of the recipe. Plain non-fat works best here since it adds moisture and protein without altering the flavor profile.
• Eggs. Two large eggs provide structure and help the cake set properly after baking. Don’t skip them or the texture will be too dense.
• Honey. Just two tablespoons is enough to complement the sweetness from the bananas and protein powder without pushing the sugar content too high.
• Oat flour. This is what gives the cake its structure, not just filler. It absorbs moisture from the wet ingredients and creates that tender coffee cake crumb. Regular flour works too, but oat flour keeps the texture denser and more satisfying.
• Espresso powder. A small amount in the batter amplifies the banana and cinnamon flavors more than you would expect. You will not taste coffee, just a deeper, richer flavor overall.
• Vanilla extract. Ties all the sweet flavors together. Real vanilla makes a noticeable difference over the imitation stuff.
• Baking powder and baking soda. Together they give this cake the lift it needs. The protein powder and oat flour are dense, so you need both leaveners to keep it from feeling heavy.
• Ground cinnamon. The star spice in any coffee cake. A full teaspoon gives you that warm, familiar flavor without needing added sugar.
• Ground nutmeg. Adds a subtle warmth that rounds out the cinnamon. A little goes a long way, so don’t skip it.
• Salt. Enhances all the other flavors. Even in a sweet recipe, it makes the banana and cinnamon taste more like themselves.
• Crushed walnuts. The crushed texture works better than whole pieces for the topping since it mixes evenly with the flour and creates those satisfying clumpy crumbs.
• Coconut oil. Melted and drizzled into the topping, it binds everything together so you actually get clumps instead of a sandy mixture.
• Natural sugar substitute. Keeps the sweetness in check while still delivering that crumb topping experience. Monk fruit or allulose blends work well here.

Reasons This Will Become a Regular

• 14 grams of protein per slice from Greek yogurt and vanilla protein powder makes it a very filling weekend breakfast that takes minimal effort to put together.
• The banana and oat flour base keeps it tasting like actual comfort food without the powdery aftertaste that sometimes comes with high protein baked goods.
• Coffee cake is a weekend favorite for a lot of people, and this version lets you enjoy it without throwing off your nutrition goals for the rest of the day.
• Mixed into a single baking dish with minimal bowls and utensils, cleanup takes less time than the 30 minute cooling period it needs to set up properly.
• The oat flour and banana base keeps this recipe accessible with everyday ingredients you already have or can grab on any quick grocery run.
• Slices well and stores neatly for 3 to 4 days, so you can grab a piece on busy mornings alongside other make-ahead favorites like Cottage Cheese Overnight Oats or Banana Walnut Oat Protein Muffins without reaching for something less satisfying.

Pairing Ideas

• Black coffee or espresso (the classic pairing that makes it feel like a real coffee shop experience)
• Scrambled eggs (filling enough to turn this into a full weekend breakfast spread)
• Greek yogurt with fresh berries on the side. Adds extra protein and keeps the meal from feeling too heavy for a morning dish, especially if you like to mix it up with something like High Protein Greek Yogurt Bowl.
• Green smoothie with spinach and banana. A lighter option that complements the warm spices without competing with them.
• Roasted vegetables like sweet potatoes or Brussels sprouts (works if you want to stretch this into a late weekend brunch with something savory)

How to Switch It Up

• Almond flour version. Swap half the oat flour for almond flour to lower the carbs and add a richer, more tender crumb that still pairs well with the banana. If you want to try another almond flour breakfast, Almond Flour Cottage Cheese Flatbread follows a similar approach.
• Dairy free option. Use coconut yogurt or soy yogurt instead of Greek yogurt and skip the walnuts if you need to keep things nut free for school lunches.
• Berry boost. Fold a half cup of blueberries or diced strawberries into the batter before baking for extra fiber and a pop of color.
• Pumpkin swap. Replace one of the bananas with unsweetened pumpkin puree and add a pinch of cardamom for a fall inspired version that still hits similar macros.

Things Worth Knowing

FAQs

Equipment Needed

• Parchment Paper
• Potato Masher
• Glass Mixing Bowl
• Baking Sheet
• Measuring Spoons

Recipe

Protein Banana Coffee Cake

A high-protein banana coffee cake packed with Greek yogurt and vanilla protein powder, topped with a cozy espresso-walnut crumb. It’s a café-style breakfast that fits into busy weeks without sacrificing flavor or protein goals.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 40 minutes mins

Rest Time 30 minutes mins

Total Time 1 hour hr 25 minutes mins

Servings: 9 servings

Course: Breakfast

Cuisine: American

Calories: 280

Ingredients Method Video Notes

Ingredients

  

Cake

• 3 medium bananas
• 1 cup plain non-fat greek yogurt
• 1/2 cup vanilla protein powder
• 2 large eggs
• 2 tablespoons honey
• 1 1/2 cups oat flour
• 1 teaspoon espresso powder or instant coffee
• 1 teaspoon vanilla extract
• 2 teaspoons baking powder
• 1 teaspoon baking soda
• 1 teaspoon ground cinnamon
• 1/2 teaspoon ground nutmeg
• 1/2 teaspoon salt

Coffee Crumb Topping

• 1/2 cup oat flour
• 1/2 cup crushed walnuts
• 4 tablespoons coconut oil
• 4 tablespoons natural sugar substitute
• 1 teaspoon espresso powder or instant coffee
• 1 teaspoon ground cinnamon

Directions

 

1. In a large mixing bowl, mash the bananas until mostly smooth. A few small chunks are totally fine and will add nice texture.
2. Add the Greek yogurt, protein powder, eggs, honey, vanilla, and espresso powder to the bowl with the bananas. Whisk until everything looks smooth and evenly combined with no big streaks of protein powder.
3. In a separate bowl, whisk together the oat flour, baking powder, baking soda, cinnamon, nutmeg, and salt, breaking up any little clumps.
4. Pour the dry ingredients into the wet. Gently fold everything together until just combined; stop as soon as you don’t see dry flour pockets. A few small lumps are okay—overmixing will give you a tougher, rubbery cake.
5. In a small bowl, stir together the oat flour, crushed walnuts, cinnamon, espresso powder, and sweetener.
6. Drizzle in the melted coconut oil and use a fork (or your fingers) to toss everything together until you get coarse, clumpy crumbs that look like small pebbles. If it looks sandy, keep squeezing it together.
7. Preheat your oven to 350°F (175°C). Line an 11×7‑inch baking dish with parchment and lightly spray the parchment and sides with oil so the cake releases cleanly.
8. Pour the batter into your prepared pan and spread it into an even layer, pushing it all the way into the corners.
9. Sprinkle the crumb mixture evenly over the top, breaking up any huge clumps but keeping some nice chunky pieces for texture.
10. Bake for 35–45 minutes, or until the top is golden and a toothpick inserted in the center comes out clean or with just a few moist crumbs attached. If the top is browning too quickly, you can tent the pan loosely with foil near the end.
11. Let the coffee cake cool in the pan for at least 30 minutes so it can set up.
12. Slice into squares and serve with coffee.

Video

Notes

Store leftovers in the refrigerator for up to 4 days. Reheat individual slices for 20 seconds in the microwave for the best texture.

Nutrition Facts