Contest-Winning Garden Harvest Chili

Ingredients

• 2 tablespoons vegetable oil
• 2 garlic cloves, minced
• 1 medium green pepper, chopped
• 1 medium sweet red pepper, chopped
• 1-1/2 cups sliced fresh mushrooms
• 1/2 cup chopped onion
• 1 can (28 ounces) diced tomatoes, undrained
• 1 can (15 ounces) tomato sauce
• 2 tablespoons chili powder
• 2 teaspoons sugar
• 1 teaspoon ground cumin
• 1 can (16 ounces) kidney beans, rinsed and drained
• 2 cups sliced zucchini
• 2 cups frozen sweet corn, thawed
• 1-1/2 cups shredded cheddar cheese, optional