Easy Creamy Bell Pepper Marinara
Ingredients:
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¼ cup butter
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1 small onion, sliced
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½ large red bell pepper, cut into matchstick-sized pieces
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1 clove garlic, minced
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¼ cup all-purpose flour
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1 cup milk
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½ cup grated Parmesan cheese
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32 ounces tomato sauce (such as Classico® Tomato and Basil Sauce)
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¼ teaspoon ground black pepper
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½ teaspoon balsamic vinegar
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1 dash hot sauce, or to taste
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1 ½ cups chopped fresh spinach