1. Heat oven to 350°F. Line two 9-inch round baking pans with foil.
2. Beat butter, granulated sugar, brown sugar and vanilla until light and fluffy. Add egg; beat well. Stir together flour and baking soda; add to butter mixture, beating until blended. Stir in milk chocolate chips. Spread half of batter into each prepared pan, spreading to 1-inch from edge. (Cookies will spread to edge when baking.)
3. Bake 18 to 22 minutes or until lightly browned. Cool completely; carefully lift cookies from pan and remove foil. Frost, if desired. Cut each cookie into 8 wedges; serve topped with scoop of ice cream, if desired. Makes 16 servings.