Karen's Chippy Cheesies

1 1/4 cups firmly packed brown sugar
3/4 cup butter flavored Crisco
1 egg
2 tablespoons milk
1 tablespoon vanilla
2 cups all purpose flour
1 teaspoon salt
3/4 teaspoon baking soda
1 cup semi-sweet chocolate mini-chips
1 cup finely chopped walnuts
2 (8 ounce) packages softened cream cheese
2 eggs
3/4 cup granulated sugar
1 teaspoon vanilla

Preheat oven to 375 degrees. Grease a 13x9x2 pan with butter flavored Crisco.
Base: Combine brown sugar and crisco in a large bowl. Beat at medium speed with electric mixer until creamy. Beat in 1 egg, milk and vanilla. Combine flour, salt and baking soda. Add gradually to creamed mixture at low speed. Stir in chocolate chips and walnuts. Spread 1/2 of dough in greased pan. Bake at 375 degrees for 8 minutes.
Filling: Combine cream cheese, 2 eggs, vanilla, and sugar in a bowl. Beat at medium speed until smooth. Pour over hot crust. Roll remaining dough into a 13x9 rectangle between sheets of wax paper. Remove top sheet. Flip dough over onto filling. Remove wax paper. Bake at 375 degrees for 40 minutes or until top is set and light golden brown. Cool to room temperature. Cut into bars. Refrigerate.