S'More Bars

1 cup quick cooking oats
1/2 cup all-purpose flour
1/2 cup packed brown sugar
1/4 tsp salt
1/4 tsp baking soda
1/2 cup melted butter or margarine
2 cups miniature marshmallows
1/2 cup milk chocolate chips

In medium size bowl, combine the first five ingredients. Stir in butter until crumbly. Press into a greased 11 x 7 baking pan. Bake at 350 for 10 minutes. Sprinkle with marshmallows and chips. Bake 5 to 7 minutes longer or until marshmallows begin to brown. Cool. Cut into squares and serve.