Seashell-Provolone Casserole

Yield: 12 Servings
Categories: Main Dishes, Pasta, Casseroles, Meats, Southern
3mdOnions; finely chopped
1/4cButter (or marg.); melted
2lbGround beef
15ozSpaghetti sauce, plain
16ozTomatoes, stewed
4ozMushroom stems and pieces; drained
1tsGarlic salt
8ozMacaroni, seashell
8ozCheese, Provolone; sliced
3cSour cream
1cCheese, Mozzarella; shredded
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