Active Time

　　20 min

　　Total Time

　　1 1/2 hr

　　

Ingredients

Makes 32 (2-inch) squares

　　1 1/2 sticks unsalted butter

　　1/2 cup chunky peanut butter

　　4 ounces unsweetened chocolate

　　2 cups packed light brown sugar

　　1 teaspoon pure vanilla extract

　　4 large eggs

　　1 cup all-purpose flour

　　1/2 teaspoon salt

　　1 1/2 cups coarsely crushed peanut brittle

　　

Step 1

Preheat oven to 350°F with rack in middle. Butter and flour a 13- by 9-inch baking pan.

　　

Step 2

Melt butter, peanut butter, and chocolate in a 3-qt heavy saucepan over low heat, stirring, until smooth. Remove from heat and cool. Whisk in brown sugar and vanilla. Whisk in eggs 1 at a time.

　　

Step 3

Whisk together flour and salt, then whisk into chocolate mixture.

　　

Step 4

Spread in pan. Bake 25 minutes.Sprinkle with brittle. Bake until a pick inserted in center comes out with crumbs, about 5 minutes. Cool completely.