Preheat oven to 325°F (160°C). Lightly grease or add liners to a muffin tin.
2. Step
In a large bowl, cream together butter and sugar. Beat in the eggs, then stir in peanut butter, bananas, flour and baking soda until blended. Fold in chocolate chips.
3. Step
Pour into prepared tins.
4. Step
Bake for 25 minutes, or until a toothpick inserted comes out clean. Remove to a wire rack to cool.
