Peanut Butter Ice Box Squares

From Kraft's What's Cooking Mag. Haven't tried it yet, but looks great and very simple.

• Ready In: 20 mins
• Serves: 36

Ingredients

• 18  graham crackers, divided
• 3⁄4 cup butter
• 2⁄3 cup  firmly packed brown sugar
• 1⁄2 cup milk
• 1  teaspoon vanilla
• 1 1⁄4 cups graham cracker crumbs
• 1⁄2 cup  smooth peanut butter

• Icing

• 2  tablespoons butter
• 3  tablespoons  smooth peanut butter
• 1 1⁄2 cups icing sugar
• 2  tablespoons milk
• 1⁄2 teaspoon vanilla

Directions

1. Line ungreased 8-inch pan with 9 of the crackers.
2. Combine butter, sugar, milk and vanilla in large saucepan. Bring to biol on medium-high heat; cook 5 minute Remove from heat.
3. Add crumbs and peanut butter. Pour mixture over wafers in pan. Cover with remaining 9 wafers. Set aside to cool.
4. Meanwhile, beat butter and peanut butter in large bowl until well blended. Add icing sugar, milk and vanilla; mix well. Spread over cooled wafer mixture in pan.