Here are the steps to make the queso dip:
Prepare the fresh ingredients: Cut the onion, Roma tomato, jalapeno, and cilantro into smaller pieces. Open the canned tomatoes with green chilis. Peel the garlic cloves.
Put all the fresh ingredients in a blender. Blend them until they are mixed well, but small pieces remain. Add some salt to taste.
Cut the American cheese and cream cheese into small cubes, about 1 inch in size. Place them in a medium-sized bowl.
Put the bowl of cheese in the microwave. Heat it for 2 and 30 seconds, stirring it every 30 seconds, until the cheese becomes smooth and melted.
Take the melted cheese out of the microwave. Add about ¾ cup of the blended mixture from the blender into the bowl with the cheese. Also, add some chili powder and cumin to the mixture. Stir everything together until it becomes smooth.
Put the bowl back in the microwave for another 30 seconds to let the flavors blend.
Serve the queso dip immediately while it's warm and ready to enjoy!