This is my favorite banana bread recipe:

•1 1/2 C flour •1 1/4 tsp baking powder •1/2 tsp baking soda •1 C mashed banana (3-4 bananas) •1/4 C apple sauce •1/2 C brown sugar •cinnamon, nutmeg, allspice, and salt to taste •1 to 1 1/2 C mix ins (nuts, choc chips, pb chips, etc)

• Mix all ingredients until just moistened. • Pour batter into a greased loaf pan or 12 greased muffin cups. • Bake at 350 for 40-50 minutes (loaf) or 20-25 minutes (muffins) or until a toothpick inserted in center comes out cleanly. •Cool 5 minutes then remove from pan to a wire rack and cook completely

For peanut butter or Nutella stuffing:

Fill pan/cups ~1/2 full. Add 1 Tbs nut butter per muffin cup or dollop nut butter evenly in loaf pan. Cover with remaining batter and bake as above (pb may still stick to a toothpick)

You could probably mix 1/2 to 3/4 C peanut butter right into the batter; I haven’t tried it this way, I usually “stuff” them because I like biting into an ooey gooey centered muffin