Preheat the oven to 350 degrees for a glass pan or 325 degrees for a dark pan.
Grease a 9 x 5 loaf pan or a larger size if needed.
In the bowl of a standard mixer with the paddle attached, combine melted butter and sugar, creaming the mixture for about 5 minutes.
Add in eggs and vanilla, mixing until smooth.
In a separate bowl, combine flour, baking soda, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until well combined.
Gently fold in mashed bananas, cottage cheese, nuts (optional), and Chopped Peanut Butter Cups.
Pour the batter into the greased 9 x 5 loaf pan. Place the loaf pan on a baking sheet to catch any overflow.
Bake for 60–75 minutes or until a toothpick inserted comes out clean.
Allow the banana bread to cool for 10 minutes before transferring it to a wire rack for further cooling and slicing.