In a skillet, cook the chorizo over medium heat until browned and cooked through, breaking it up with a spoon. Drain off any excess grease.
0.5 pound Chorizo
Add the shredded Monterey Jack and Oaxaca cheese to the skillet with the chorizo. Stir until the cheese is melted and combined. If using, stir in the diced tomatoes, diced onion, and cumin.
0.5 pound Chorizo
Transfer the mixture to a small oven-safe dish or cast-iron skillet. Bake for 10-15 minutes, or until the cheese is bubbly and slightly golden on top.
Serve immediately with tortilla chips, crackers, or as a topping for other dishes.
Notes
Adjust the optional ingredients to your preference. For a spicier dip, add some chopped jalapeños.