Tex Mex Corn Chowder

Name: Tex Mex Corn Chowder
Ingredients: 1 lb. ground pork sausage (may substitute ground beef, or ground turkey); 1 tsp. granulated onion, or 1 medium yellow onion, diced; 3 cloves garlic, minced; 1/2 tsp. red pepper flakes; 2 cans Campbell's Cream of Chicken Soup, 10 3/4 oz. each; 2 cans diced tomatoes and green chilis (such as Rotel), with juices; 1-2 cups sweet corn; 2-3 cups milk, depending on how thick you prefer your chowder; 1/4 cup chopped fresh cilantro; sour cream, guacamole, salsa, tortilla chips, shredded cheddar or Colby-Jack cheese, for garnishing