Heat oven to 375 deg f. Combine crisco, brown sugar, milk and vanilla in a large bowl. Beat at medium speed until creamy. Beat egg into creamed mixture. Combine flour, soda and salt and mix into creamed mixture until just blended. Stir in chocolate chips. Drop dough by rounded tablespoonfuls onto ungreased baking sheet. Bake for 8 to 10 minutes for chewy cookies or 11 to 13 minutes for crisp cookies. Cool on baking sheet for 2 minutes. Remove to wire rack. Makes 3 dozen 3 inch diameter cookies.