Preheat oven to 350ºF. Lightly spray a 9×13-inch baking dish with cooking spray.: Warmth from the oven ensures even baking and a bubbly finish, while lightly greasing the pan prevents sticking and helps remove cleanly. You should feel the anticipatory warmth and smell a faint oven scent once preheated. If the oven temperature is too low the casserole may take much longer to bubble and brown. A frequent mistake is skipping the spray, which can make the finished casserole cling to the pan and break when served.
Brown ground beef in a large skillet. Drain fat. Add taco seasoning and water. Simmer for 5 minutes. Remove from heat. Stir in Rotel tomatoes, cream of chicken, cream of mushroom, enchilada sauce, hot sauce, and black eyed peas.: As the ground beef browns you will hear a steady sizzle and notice little browned bits forming on the skillet surface, which are packed with flavor. Browning develops caramelized notes, adding depth to the final dish. Draining fat removes excess grease so the sauce does not become oily, but leave some browned bits in the pan to deglaze. Overcrowding the pan can cause the meat to steam instead of brown, producing a less flavorful base.
Spread 1/2 to 3/4 cup of the meat mixture in the bottom of the baking dish. Top with 1/3 of the tortillas, 1/3 of the remaining meat mixture, and 1 cup of cheese. Repeat layers 2 more times.: The spices bloom when simmered, releasing fragrant aromas and a richer, integrated flavor. The simmer will thicken the meat mixture and concentrate the seasoning flavors. You should smell the spice blend deepen and see the sauce reduce slightly. Too vigorous a boil will evaporate too much liquid, resulting in a drier mixture than desired.
Bake for 30 to 35 minutes, until bubbly.: The moment you fold in the canned soups and tomatoes the mixture becomes noticeably saucy and aromatic; the steam will carry tomato and savory mushroom notes. Stir gently to combine so the texture stays cohesive. This blend creates the creamy binder that holds the casserole together. A common error is not draining the beans; excess can water down the sauce, so ensure the black eyed peas are well drained.
Spread 1/2 to 3/4 cup of the meat mixture in the bottom of the baking dish: When you spread the first spoonfuls across the baking dish you should see a thin, even sheen of sauce that will prevent the tortillas from drying. This base layer anchors the casserole and provides moisture from the very first bite. If you pile too much in one spot, the layers can be lopsided and cook unevenly, so aim for an even coating.
Top with 1/3 of the tortillas, 1/3 of the remaining meat mixture, and 1 cup of cheese: As you build the first full layer the corn tortillas will begin to soften as they absorb the warm sauce, making a tender, pillow like layer that contrasts with melted cheddar cheese . Distribute ingredients evenly so each portion gets similar ratios. A mistake people make is clustering tortillas instead of spreading them; that can cause pockets of dryness or overly dense patches.
Repeat layers 2 more times: With each repetition you will notice the layers compact and the cheese start to meld, creating a unified texture. The repeated layering ensures every serving has a balance of meat, beans, tortillas, and cheese. Press gently so layers make contact, but do not compress them to the point of becoming dense. Over packing the dish can prevent even cooking and a pleasing mouthfeel.
Bake for 30 to 35 minutes, until bubbly: During baking the casserole will release a warm, inviting aroma of melted cheddar cheese and seasoned ground beef . Look for steady bubbling around the edges and a lightly browned top to know it is done. The bubbling indicates the internal temperature is high enough and the sauce has thickened. Removing it too early will yield a runny center, while leaving it far too long could dry the tortillas and toughen the peas.