Preheat the oven to 350℉. Spray the muffin tin cups with cooking spray or line the tin with paper muffin cups.
Cream butter, peanut butter and sugar in a large bowl with a handheld mixer or in a stand mixer on medium speed for 2 - 3 minutes until the mixture is light and fluffy.
Add the 2 eggs to the butters and sugar and mix well until combined.
Sift the peanut flour baking blend with baking powder, baking soda and salt. With a wooden spoon, stir the flours into the butter, sugar and egg mixture until just combined. Be careful not to over stir. You should still see pockets of the dry mix.
Add the crushed bananas and mix them into the mixture.
Gently stir in the chocolate chips and peanuts.
With a ⅓ cup measuring cup or a 3 oz scoop, divide the batter evenly between the muffin tin wells.
Place the muffins in the center of the preheated oven and bake for about 25 minutes. They should be slightly browned, puffy and firm.
Cool muffin tin on a wire rack for 10 minutes, then remove the muffins from the tin to finish cooling.