1Heat oven to 350°F. In ungreased 9-inch square pan, mix flour, granulated sugar, 2 tablespoons cocoa, baking powder and salt. Stir in milk, butter and vanilla with fork until smooth, making sure to incorporate dry ingredients in corners of pan. Stir in chocolate chips.
2Spread batter in pan. Sprinkle with brown sugar and 1/4 cup cocoa. Pour hot water evenly over batter.
3Bake about 40 minutes or until top is dry. Cool 10 minutes. Spoon warm cake into dessert dishes. Spoon sauce from pan onto each serving. Top with ice cream; sprinkle with nuts.