Easiest Peanut Butter Fudge

½ cup butter

1 (16 ounce) package brown sugar

½ cup milk

¾ cup peanut butter

1 teaspoon vanilla extract

3 ½ cups confectioners sugar

Melt butter in a medium saucepan over medium heat. Stir in brown sugar and milk. Bring to a boil and boil for 2 minutes, stirring frequently. Remove from heat. Stir in peanut butter and vanilla. Pour over confectioners sugar in a large mixing bowl. Beat until smooth; pour into an 8x8 inch dish. Chill until firm and cut into squares.