- 1 cup whole wheat flour
 - 1 cup all-purpose flour
 - 1 cup chocolate chips
 - 1/2 cup vanilla whey protein powder
 - 1/2 cup white sugar
 - 1/4 cup unsweetened cocoa powder
 - 1 teaspoon baking soda
 - 1 cup milk
 - 1 cup peanut butter
 - 3 eggs
 - 1/2 cup vegetable oil
 - 1/2 cup plain yogurt
 
- Preheat oven to 400 degrees F (200 degrees C). Grease mini muffin cups.
 - Combine whole wheat flour, all-purpose flour, chocolate chips, protein powder, sugar, cocoa powder, and baking soda in a large bowl.
 - Whisk milk, peanut butter, eggs, oil, and yogurt in another bowl until smooth. Pour over flour mixture and stir until batter is just blended. Fill muffin cups 3/4 of the way full.
 - Bake in the preheated oven until a toothpick inserted into the centers comes out clean, about 10 minutes. Cool in the muffin pans for 10 minutes before removing to a wire rack until completely cooled, about 20 minutes.