Polenta Pizza
Ingredients:
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1 tablespoon olive oil
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1 Spanish onion, thinly sliced
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1 green bell pepper, thinly sliced
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1 (3.5 ounce) link hot Italian sausage, sliced
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¼ cup sliced fresh mushrooms, or more to taste
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1 slice prepared polenta, cut into 4x4-inch piece
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¼ cup spaghetti sauce, or as needed
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1 ounce shredded mozzarella cheese