Start by cubing the white American cheese into small pieces. Grate the sharp cheddar cheese if you haven't already. This will ensure a smooth melting process.
In your crock-pot, add the cubed white American cheese, shredded sharp cheddar cheese, undrained diced tomatoes with green chilies, and whole milk.
Sprinkle in the chili powder, ground cumin, garlic powder, and onion powder. These spices will enhance the dip's flavor, adding a lovely warmth without overpowering the cheese.
Gently stir all the ingredients together until they are well combined. Then, cover the crock-pot with its lid.
Set your crock-pot to the low setting and let it cook for about 2 to 3 hours. Stir occasionally to ensure the cheese melts evenly and doesn’t stick to the sides.
Once the cheese is fully melted and the dip is creamy, it’s time to serve! Stir one last time before ladling it into a serving bowl. Garnish with freshly chopped cilantro for a burst of color and freshness.