Start by preheating your oven to 350°F (175°C). A hot oven is crucial for ensuring your dish bubbles and melds beautifully as it bakes.

In a large skillet over medium heat, add the lean ground beef or turkey. Stir it occasionally until browned and fully cooked, about 5-7 minutes. Make sure to break up any clumps with your spatula for an even cook.

Once the meat is cooked, toss in the finely chopped onion, chili powder, cumin, and salt. Stir for another 2-3 minutes until the onions become translucent.

Now, add the petite diced tomatoes and tomato sauce, mixing thoroughly. Let this wonderful blend simmer on low for about 5 minutes.

While the meat simmers, take your soft corn tortillas and warm them slightly in a separate skillet or microwave. This step ensures they become pliable and easier to layer without tearing.

In a baking dish, start layering! First, place two corn tortillas at the bottom. Next, spoon a layer of the meat mixture on top, followed by a generous sprinkle of shredded cheese. Repeat this layering process until all ingredients are used, ending with a layer of cheese on top.

Cover your baking dish with foil and pop it into the preheated oven. Bake for around 25 minutes. Remove the foil for the last 10 minutes to get that beautiful cheese crust browned and bubbly.

Once out of the oven, let it rest for about 5 minutes. Sprinkle chopped cilantro and sliced black olives on top before serving. Dive into your chili stack!