Use jelly roll size pan.

CARAMEL SAUCE:

1 sq. butter
1 (14 oz.) pkg. caramels
1 can sweetened condensed milk

Melt together and bring to boil. Set aside.

1 1/2 sq. butter
8 c. Rice Krispies
1 (16 oz.) pkg. mini-marshmallows

Melt together and press 1/2 of this in jelly roll size pan. Pour caramel sauce on top. Put rest of Rice Krispies mixture on top of sauce. Cool. Cut in squares.