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Bring a pot of water to boil. Cook the pasta according to the package directions. While the pasta cooks, proceed with the recipe below.
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Heat 1 tablespoon of olive oil on medium heat in a large, high-sided skillet.
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Add sliced mushrooms and cook for 3 or 5 minutes until they are cooked through but not overcooked. Remove mushrooms from the skillet.
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To the same, now empty, skillet, add crumbled sausage and cook on medium heat for about 5 minutes or until the sausage is cooked. Drain excess fat.
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To the same skillet with sausage, add minced garlic, Italian seasoning, red pepper flakes, tomato pasta sauce, and fresh spinach. Bring to a boil on medium heat and stir everything well. Cook on medium heat, stirring frequently, for 5 minutes until the spinach wilts to your liking.
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Add cooked and drained pasta to the sauce. Reheat.
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Mix everything well. Remove from heat.
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Season with salt, freshly ground coarse black pepper, and red pepper flakes, if you like. Top with cooked sliced mushrooms.
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Tip: use your best judgment about the salt. If the sausage is salty enough, you might not need to add any extra salt.