Peanut Butter Fudge

My mom used to get a little peanut butter fudge when she went to craft shows.  She no longer goes to craft shows so I decided to find a peanut butter fudge recipe and make it for her.

1/2 cup butter
2 1/4 cups brown sugar
1/2 cup milk
3/4 cup peanut butter
1 tsp. vanilla
3 1/2 cups powdered sugar

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