Step 1: Prep Your Oven and Pan Preheat your oven to 350°F (175°C) and line a square baking pan (8x8 or 9x9 inch) with parchment paper, leaving overhang for easy removal. Don't skip the parchment—this Healthy Greek Yogurt Chocolate Oatmeal Banana Brownie can stick without it, and trust me, cleanup becomes a nightmare!

Step 2: Create the Wet Base In a large bowl, combine the mashed banana, Greek yogurt, peanut butter, honey, and egg. Mix everything until completely smooth and creamy—this takes about 2-3 minutes of vigorous stirring, but it's crucial for achieving that perfect fudgy texture.

Step 3: Add the Dry Ingredients Gradually stir in the cocoa powder, oat flour, rolled oats, and baking powder until just combined. Don't overmix—we want a tender, fudgy brownie, not a tough one! The batter should look rich and chocolatey with visible oat pieces throughout.

Step 4: Pour and Smooth Transfer the batter to your prepared pan and smooth the top evenly with a spatula. The batter will be thick, which is exactly what creates that perfect dense, brownie-like texture in this Healthy Greek Yogurt Chocolate Oatmeal Banana Brownie.

Step 5: Bake to Perfection Bake for 20-22 minutes until the edges are firm but the center is still slightly soft when gently pressed. Don't overbake—the secret to fudgy texture is pulling it out when it's just set but still has that slight give in the center.

Step 6: Cool and Slice Let the brownie cool completely in the pan before slicing—this is crucial for clean cuts and prevents crumbling. The cooling time allows the structure to set while maintaining that perfect fudgy interior.