INGREDIENTS
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2 cups grated Parmesan cheese
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1 (16 ounce) package penne pasta
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4 skinless, boneless chicken breast halves
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3 egg whites, lightly beaten
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2 (16 ounce) jars Alfredo sauce
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2 (14.5 ounce) cans Italian-style diced tomatoes
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1 (8 ounce) can tomato sauce
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1/4 teaspoon red pepper flakes, or to taste
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1 (8 ounce) package sliced fresh mushrooms
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1 (8 ounce) package fresh spinach
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1 cup grated Parmesan cheese