01 - Preheat oven to 425°F. Arrange tater tots in an even layer on a large baking sheet and bake according to package instructions, typically 25–30 minutes, turning once for optimal crispness.
02 - Warm olive oil in a large skillet over medium heat. Sauté diced onion until soft, approximately 4 minutes. Add minced garlic, cooking for an additional minute. Crumble ground beef into the pan and brown thoroughly, draining excess fat if required.
03 - Incorporate diced tomatoes, kidney beans, tomato paste, chili powder, cumin, smoked paprika, salt, and pepper. Stir well, letting the mixture simmer for 10–12 minutes until thickened, while adjusting seasoning to preference.
04 - Boil elbow macaroni in a large pot of salted water according to package instructions. Drain fully and set aside.
05 - Melt butter in a saucepan over medium heat. Whisk in flour and cook for 1 minute. Slowly add milk while whisking continuously until smooth. Bring to a gentle simmer and cook until thickened, 3–4 minutes. Off heat, fold in cheddar cheese, seasoning with salt and pepper until cheese is fully melted.
06 - Mix drained macaroni into cheese sauce, stirring to coat evenly.
07 - Transfer crisp tater tots to a large serving platter or ovenproof dish. Evenly spoon mac and cheese onto the tots, then add a generous layer of chili over top. Sprinkle remaining shredded cheese over the assembled dish.
08 - Return assembled dish to the oven for 5–7 minutes, until cheese is melted and bubbling.
09 - Finish with sliced green onions, chopped cilantro, and jalapeño if desired. Serve hot.