In a medium-sized saucepan, over medium heat, sauté onion, garlic, and jalapenos until soft, about 5-7 minutes.
In a separate bowl, whisk together almond milk and cornstarch. When veggies are soft, slowly add milk/cornstarch mixture to saucepan. Increase heat to medium high until the mixture begins to boil.
Reduce heat to medium low. Whisk in cumin and chili powder. Add in canned chilis and tomato with all of their juices. Simmer until sauce is slightly thick, about 4-5 minutes.
Whisk in cream cheese until it completely melts through the sauce. Remove sauce from heat.
Slowly fold in cheddar cheese, about 1/4 cup at a time, until all cheese has completely melted into the sauce. If you try to add all the cheese in at once, it might clump together.
Season with salt and pepper to taste. Serve warm.
If the queso is too thin, return to medium-low heat and simmer until thicker. If too thick, thin out out a few splashes of almond milk.