- 1 ripe banana
- ½ stick (4 Tablespoons) unsalted butter
- 1∕3 cup granulated sugar
- ½ cup peanut butter
- 1∕3 cup light brown sugar, packed
- 1 large egg
- ½ teaspoon vanilla extract
- ½ cup all-purpose flour
- ½ cup whole wheat flour
- ½ teaspoon baking soda
- 2∕3 cup rolled oats
- ½ cup raisins (or ⅓ cup chocolate chips)
- Baking sheet
- Large bowl
- Measuring cups
- Measuring spoons
- Microwave-safe bowl
- Mixing spoon
- Sharp knife
- Preheat oven to 375°F.
- Mash the banana with a fork.
- Cut butter in half. In a microwave-safe bowl, heat in microwave 10–15 seconds to soften. Be careful not to melt butter.
- In a large bowl, use a mixing spoon to blend butter, banana, and sugar.
- Add peanut butter and brown sugar. Continue mixing until completely combined.
- Add egg and vanilla. Mix until smooth.
- Add flours and baking soda. Mix until smooth.
- Stir in rolled oats. If using chocolate chips or raisins, gently stir in now.
- Scoop dough with a teaspoon. Shape into 1-inch balls. Place dough balls 2 inches apart on an ungreased baking sheet. Flatten dough balls by using a fork to make a criss-cross pattern on the cookies.
- Bake on middle rack of oven until cookies are lightly browned on bottom, about 8–10 minutes. Remove from oven. Let sit 5 minutes to firm up. Remove from tray.