Brown your ground beef in a skillet, using a wooden spoon to break it into fine pieces. Remember nice and fine, don't be afraid to add a tablespoon or two of water to help the beef break down. Season it to taste with chili powder, cumin, ground oregano, cayenne, salt & pepper. Drain well.
In a microwaveable bowl, add the cubed American cheese, butter and milk. Microwave in one minute intervals, stirring in between until cheese has melted. Stir in cumin, garlic powder and finely diced jalapeno if desired.
Heat beans in saucepan over medium heat. Stir in sour cream and cheese and continuing cooking until combined.
Preheat oven to 375 degrees.
On an oven proof baking sheet, pile chips with beef, beans, cheese and sliced jalapeños (optional); repeat. Bake until cheese is bubbly and just beginning to brown, about 10 - 15 minutes.