Prepare ground beef. Stir in pizza sauce; cook 2 to 3 minutes or until heated through, stirring frequently. Keep warm and set aside. 

Italian-Style Beef Sausage: Combine 1 pound Ground Beef, 1 teaspoon fennel seed, 1/2 teaspoon salt, 1/4 teaspoon coriander, 1/4 teaspoon garlic powder, 1/4 teaspoon paprika, 1/4 teaspoon black pepper and 1/8 to 1/4 teaspoon crushed red pepper in large bowl, mixing lightly but thoroughly. Heat large nonstick skillet over medium heat until hot. Add sausage mixture; cook 8 to 10 minutes, breaking into 1/2-inch crumbles and stirring occasionally.

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Place sandwich thins, cut sides up, on rack of broiler pan. Spoon equal amounts of sausage mixture on each bread half. Evenly sprinkle with cheese and toppings, as desired.

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Place pizzas on rack of broiler pan so surface of cheese is 3 to 4 inches from heat. Broil 4 to 5 minutes or until cheese is melted and bubbly.

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adapted from beefitwhatsfordinner