Heat a skillet over medium-high heat. Add the ground beef and cook until browned, about 5 minutes.
Add the diced onion and minced garlic to the skillet with the ground beef. Cook until the onion is translucent, about 3-4 minutes.
Add the chili powder, ground cumin, salt, and black pepper to the skillet with the ground beef. Stir to combine and cook for 1-2 minutes.
Remove the skillet from heat and let it cool for a few minutes.
In a mixing bowl, combine the ground beef mixture and 1 cup of shredded cheddar cheese. Stir to combine.
Warm the tortillas in a microwave or on a griddle until they're soft and pliable.
Divide the ground beef and cheese mixture among the tortillas, placing the filling in the center of each tortilla.
Roll up the tortillas tightly and place them seam-side down in a baking dish.
Pour the chili sauce over the enchiladas, making sure they're completely covered.
Sprinkle the remaining shredded cheddar cheese over the top of the enchiladas.
Bake in the preheated oven for 20-25 minutes, or until the cheese is melted and bubbly.
Remove the enchiladas from the oven and let them cool for a few minutes before serving.
Notes
Storage:Enchiladas can be stored in an airtight container in the refrigerator for up to 3 days. To reheat, microwave or bake in the oven until warmed through.