Queso

Name: Queso
Prep time: 5 min
Cook time: 10 min
Total time: 15 min
Yield: 8
Ingredients: Ingredients; 1 tablespoon butter; 1 small onion, finely chopped; 2 cloves garlic, minced; 1 jalapeño, finely chopped (optional, for heat); 2 cups shredded cheddar cheese (or Mexican blend cheese); 1 cup shredded Monterey Jack cheese; 1 tablespoon all-purpose flour; 1 cup whole milk; 1/2 cup diced tomatoes (or a can of Rotel, drained); Salt and pepper, to taste; Fresh cilantro, chopped (for garnish)