1. Melt butter in a Dutch oven over medium-high heat; add bell pepper and next 3 ingredients, and sauté 4 to 5 minutes or until tender. Add corn, zucchini, and cumin, and sauté 5 minutes or until tender. Gradually stir in broth, stirring to loosen particles from bottom of Dutch oven. Bring to a boil; cover, reduce heat to low, and simmer 15 minutes.
2. Whisk together flour and next 2 ingredients. Stir into corn mixture, and cook over medium heat, stirring constantly, 5 minutes or until thickened. Reduce heat to low.
3. Add asadero cheese, 1 cup shredded Cheddar cheese, and salt, and cook, stirring constantly, until cheeses melt and mixture is thoroughly heated. Serve with desired toppings.
*Monterey Jack cheese may be substituted.