Slow Cooker Zucchini Soup
Ingredients:
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1 ½ pounds sweet Italian sausage
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2 cups 1/2-inch pieces celery
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2 pounds zucchini, cut into 1/2-inch slices
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2 (28 ounce) cans diced tomatoes
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2 green bell peppers, cut into 1/2-inch slices
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1 cup chopped onion
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2 teaspoons salt
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1 teaspoon white sugar
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1 teaspoon dried oregano
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1 teaspoon Italian seasoning
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1 teaspoon dried basil
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¼ teaspoon garlic powder
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6 tablespoons grated Parmesan cheese, or to taste