1/4 cup butter, softened
1 1/2 cups sugar
3 eggs
1 cup brown sugar
1/2 teaspoon vanilla extract
1 cup all-purpose flour
3/4 teaspoon baking powder
1 1/2 teaspoons peanut butter
1 pinch salt
1 cup all-purpose flour
2 1/2 cups rolled oats
Preheat oven to 350 degrees F (175 degrees C). Grease muffin cups or line with paper muffin liners.
In a medium bowl, cream together butter, brown sugar, eggs, brown sugar, and vanilla until smooth. Beat in flour, baking powder, peanut butter, and salt. Combine the brown sugar mixture and the oats, mix well. Spoon the batter into the prepared pans.
Bake in preheated oven for 30 minutes, or until a toothpick inserted into the middle of the muffin comes out clean. Remove muffins from oven and sprinkle with sprinkles.