Heat a dry skillet (cast iron works beautifully here) over medium-high heat. Working with one tortilla at a time, place it directly on the hot surface for just a few seconds on each side. You're not trying to cook them fully—just enough to warm them and make them pliable. This step is crucial because it adds a subtle toasted flavor and makes the tortillas flexible enough to roll without cracking. If you skip this step, your tortillas will likely tear when you try to roll them, so don't rush through it. Stack your finished tortillas on a plate and cover them with a clean kitchen towel to keep them warm and soft while you prepare the filling.

In a medium mixing bowl, combine three-quarters of your shredded cheese (save the remaining quarter for topping). Add your drained green chiles, sour cream, garlic powder, cumin, salt, diced onion, and cilantro if using. Stir everything together until you have a smooth, cohesive filling. The sour cream is what keeps this mixture from drying out during baking, so don't skip it even if you're trying to cut costs. This filling can be made up to one day in advance and refrigerated, which makes this recipe perfect for entertaining—just let it come back to room temperature before assembling.

Preheat your oven to 350°F. Pour about half a cup of your enchilada sauce into the bottom of a large 9x13-inch casserole dish and spread it evenly to coat the surface. This layer prevents sticking and ensures the bottoms of your enchiladas stay moist and delicious. If you don't have enough sauce to cover the bottom completely, that's fine—just do your best to distribute what you have. The sauce will spread more as the enchiladas bake.

Working with one warm tortilla at a time, place it on a clean work surface. Spoon about 3 tablespoons of your cheese filling down the center of the tortilla. Don't overfill—this is the most common mistake I see, and it makes rolling difficult. Roll the tortilla tightly from one side to the other, creating a compact cylinder. Place it seam-side down in your prepared baking dish. Continue this process with all twelve tortillas, arranging them side by side in the dish. They should fit snugly but not be packed so tightly that they can't expand slightly as they bake.

Pour the remaining cup of enchilada sauce evenly over all the rolled tortillas. Make sure every enchilada gets a good coating of sauce—this keeps them moist and prevents the edges from drying out. Then sprinkle your reserved cheese over the top. You can be generous here since the cheese is what creates that beautiful golden, bubbly presentation that makes people excited to eat.

Place your casserole dish in the preheated 350°F oven and bake for exactly 20 minutes, or just until the cheese is completely melted and the sauce is bubbling around the edges. Don't overbake beyond this point, as extended heat can cause the cheese and filling to separate slightly, creating an unpleasant grainy texture. You want to pull these out while everything is still cohesive and creamy. If your kitchen runs cool or your oven bakes unevenly (many do), check around the 18-minute mark to see how things are progressing.

Let your enchiladas rest for 2-3 minutes straight from the oven before plating. This allows the filling to set slightly and makes serving cleaner and easier. During this time, the residual heat finishes gently cooking the filling without continuing to bake the tortillas.