Potatoes Ranchero

1/4 cup butter or margarine
1/4 cup all-purpose flour
2 cups milk
1 teaspoon salt
Dash black pepper
2 cups (8 ounces) grated sharp Cheddar cheese
1/2 cup green onion slices
6 cups cooked potato slices
1 green bell pepper, cut into rings
1/4 cup barbecue sauce

Preheat oven to 350 degrees F.

Make a white sauce with butter, flour, milk and seasonings. Add cheese and onion slices. Stir until cheese melts. Layer half of potatoes and cheese sauce in an 11 x 7-inch baking dish. Repeat layers. Top with green pepper and drizzle with barbecue sauce. Bake for 25 to 30 minutes or until hot.