Preheat your oven to 425°F (220°C). Toss the cauliflower florets with 1 tablespoon of olive oil, salt, and pepper in a large bowl until evenly coated. Spread them in a single layer on a baking sheet, making sure they're not crowded. Roast for 20-25 minutes, stirring halfway through, until golden brown with crispy edges and some darker caramelized spots.

While the cauliflower roasts, heat the remaining tablespoon of olive oil in a large skillet over medium-high heat. Add the chopped onion and sauté for 3-4 minutes until translucent and softening at the edges. Stir in the minced garlic and cook for 30 seconds until fragrant.

Add the ground beef to the skillet, breaking it up with a spoon into small crumbles. Cook for 6-8 minutes, stirring occasionally, until the beef is browned with no pink remaining and you see crispy, caramelized bits forming on the bottom of the pan.

Stir in the chile powder, smoked paprika, cumin, cayenne pepper (if using), salt, and black pepper. Cook for 2 more minutes to toast the spices and let the flavors meld together.

Remove the skillet from heat and stir in the fresh lime juice and chopped cilantro.

Divide the roasted cauliflower among serving bowls and top generously with the crispy chile ground beef. Add your favorite toppings and serve immediately while hot.