Cooked Peanut Butter Frosting

1 cup packed brown sugar

3 tablespoons butter

¼ cup heavy cream

1 teaspoon vanilla extract

3 tablespoons peanut butter, or to taste

2 cups confectioners sugar

Combine brown sugar, butter, cream, vanilla, and peanut butter in a large sauce pan. Bring to a boil over medium-high heat, stirring frequently. Remove from heat and add confectioners sugar and mix well. Pour over a cooled cake and spread frosting quickly.