With an electric mixer, mix together wet ingredients: egg, heavy cream, peanut butter, and vanilla extract.

Add dry ingredients.  You can use the electric mixer or fold in the dry ingredients with a rubber spatula.

Place mixture into mini-muffin tray or larger sized trays if you're making brownie a la modes.

Bake in oven for 15-25 minutes, depending on the size of your brownie.  Use a toothpick or fork to make sure that the inside of the brownie is completely cooked.