Hot Fudge Sundae Cake
["3/4 c. all-purpose flour", "2/3 c. granulated sugar", "1/2 c. unsweetened cocoa powder", "1 1/2 tsp. salt", "1/2 c. milk", "3 Tbsp. vegetable oil", "1/2 c. chopped walnuts (optional)", "2/3 c. packed brown sugar", "1/3 c. semi-sweet mini chocolate chips", "1 1/4 c. hot water", "vanilla ice cream"]
["Heat oven to 350\u00b0.", "In ungreased 8 x 8-inch pan mix flour, granulated sugar, 1/4 cup cocoa, baking powder and salt.", "Stir in milk and oil until well blended.", "(Stir in nuts if using.)"]
["all-purpose", "granulated sugar", "cocoa", "salt", "milk", "vegetable oil", "walnuts", "brown sugar", "semi-sweet mini chocolate chips", "water", "vanilla ice cream"]