In large bowl, beat butter with brown sugar. Beat in vanilla and eggs. Stir in flour just until mixed. Fold in chocolate chips. Spoon batter into greased 8 inch square baking dish; bake in preheated 350 F oven 35 to 40 minutes or until cake tester inserted in centre comes out clean. Cool. Cut into 12 squares. While squares are baking, make sauce. Place butter, sugar and cream in medium saucepan and bring to a boil. Cook, stirring, about 2 minutes. Add vanilla. Cool. Serve brownies with a scoop of ice cream and a drizzle of sauce. Makes 12 servings.