Steps
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1Heat oil in 10-inch skillet over medium-high heat. Cook onions and carrots in oil 3 to 4 minutes, stirring frequently, until crisp-tender. Stir in mushrooms and bell peppers.
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2Spoon vegetables into 4- to 6-quart slow cooker. Stir in remaining ingredients except spaghetti and cheese.
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3Cover and cook on low heat setting 8 to 10 hours.
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4Cook and drain spaghetti as directed on package. Serve sauce over spaghetti. Sprinkle with cheese.