Vegetarian Crock Pot Spaghetti Sauce is Rich and Simple to Make

Name: Vegetarian Crock Pot Spaghetti Sauce is Rich and Simple to Make
Cuisine: European, Italian, Mediterranean
Ingredients: 2 tbsp. olive oil; 1 onion (chopped); 3 cloves garlic (minced); 2 carrots (one chopped, one shredded); 1 (8-ounce) package sliced mushrooms; 1 green bell pepper (chopped); 15 oz. can tomato sauce; 2 (14 oz.) cans of diced tomatoes (undrained); 6 oz. can tomato paste; 1 tsp. dried Italian seasoning; 1/4 tsp. pepper; 1/2 tsp. salt; 2 tsp. sugar; 16 oz. box spaghetti