Moist 'n' Chewy Brownies

1 cup (6 ounces) semisweet chocolate chips
1/4 cup butter or margarine
2 cups biscuit baking mix
1 (14 ounce) can Eagle Brand sweetened condensed milk
1 egg, beaten
1 cup chopped nuts

Over very low heat, melt chips and butter, stir occasionally until well blended. Remove from heat. Add baking mix, sweetened condensed milk and egg; stir well. Add nuts. Pour into greased 9 x 12-inch pan. Bake for 20 to 25 minutes. Cool and cut into squares.