2 tbsp. butter
1/2 lb. mushrooms, sliced
1/8 tsp. pepper
4 bakery croissants
4 tsp. prepared mustard
1/2 lb. thinly sliced roast beef
1 lg. tomato
1/2 lb. Brie or Port du Salut cheese, sliced

About 45 minutes before serving:

In 2-quart saucepan over medium high heat, in hot butter, cook mushrooms and pepper until tender and lightly browned, stirring frequently, about 5 minutes.

Preheat oven to 375 degrees. Slice each croissant horizontally in half. Spread bottom halves of croissants with mustard; top with roast beef slices, sauteed mushrooms, tomato slices, and cheese, cutting cheese to fit. Replace top halves of croissants.

Place sandwiches on cookie sheet; cover loosely with foil. Bake sandwiches 15 minutes or until cheese is just melted and sandwich is heated through. Makes 4 servings. 380 calories per serving.