4 squares unsweetened chocolate
2 sticks butter
4 eggs
2 c. sugar
1 c. flour
1 tsp. vanilla
1 c. semi-sweet chocolate chips

Melt unsweetened chocolate and butter; let cool slightly.

Meanwhile, beat 4 eggs with sugar in a large bowl. Add melted chocolate mixture to eggs. Add flour and vanilla. Mix well with spoon. Pour into greased 9x13 inch pan. Sprinkle semi-sweet chocolate chips on top. Bake at 350 degrees for 35-40 minutes. Cool 20 to 30 minutes in pan on rack. Cut into squares.