3/4 cup buttermilk (or 3/4 cup milk and 1/2 teaspoon fresh lemon juice)
3/4 cup semi-sweet chocolate chip chunks
Directions
Preheat oven to 375 degree F. Line a 12-cup muffin pan with paper liners.
In a mixer fitted with the paddle attachment cream the butter, brown sugar and peanut butter.
Add the eggs and vanilla and continue to mix.
Combine the flour, baking powder, baking soda and salt in a medium bowl by whisking.
On low speed, add the flour mixture alternately with the buttermilk to the butter/peanut butter mixture. Do not over mix. Gently fold in the chocolate chunks.
Evenly divide the batter into the muffin pan. Bake for 20-23 minutes, or until a toothpick inserted into the center of the muffin comes out clean. Cool 10 minutes before serving.