Frosty Strawberry Squares(Serves 12 To 16)  
["1 c. all-purpose flour", "1/2 c. chopped nuts", "1/2 c. melted butter", "1/4 c. packed brown sugar", "2 egg whites", "2 c. sliced strawberries", "1 c. sugar", "2 Tbsp. lemon juice", "2 c. whipped topping"]
["Preheat oven to 350\u00b0."]
["flour", "nuts", "butter", "brown sugar", "egg whites", "strawberries", "sugar", "lemon juice", "topping"]