Step 1

Preheat oven to 350 degrees F (177 degrees C).

Step 2

In a small bowl, mix together the brown sugar and the egg yolk with a fork.

Step 3

Add the peanut butter and mix well.

Step 4

Add the flour and baking powder and stir until ingredients are well incorporated.

Step 5

Pour into a greased ramekin or other small baking dish (I use a baking dish that holds around 8-ounces).

Step 6

Sprinkle a pinch of sugar over top of cookie.

Step 7

Bake for 8 minutes