Once the skillet is hot, add ground beef and spices. Cook, breaking apart with a spoon, until browned and crumbly, 4-5 minutes.
1 ½ lb lean ground beef
2 tsp cumin
2 tsp chili powder
1 tsp oregano
½ tsp salt
Meanwhile, peel and mince garlic. Once the beef is done cooking, add the garlic and stir to combine. Transfer to a medium bowl and loosely cover with foil.
2 cloves garlic
Peel and small dice onion.
1 medium yellow onion
Return skillet to medium-high heat, add butter and swirl to coat the bottom. Add onion and cook, stirring often, until it begins to soften, 4-5 minutes.
2 tbsp butter, unsalted
Meanwhile, cut the cauliflower head into quarters, then trim off and discard the leaves and thick stem. Using a box grater or food processor, coarsely grate the cauliflower.
Add cauliflower and spices to the skillet with the onion. Continue to cook, stirring often, until cauliflower is lightly golden and cooked through, 6-8 minutes more.
1 tsp chili powder
1 tsp salt
½ tsp black pepper
Grate the cheese.
½ (8 oz) block cheddar cheese
Shave cilantro leaves off the stems; discard stems and mince the leaves.
Cut one lime into wedges, reserving the other lime for the cauliflower rice.
When the cauliflower rice is done, juice remaining lime into the skillet. Add cilantro and beef; gently stir to combine and continue to cook until heated through, 2 minutes more.
Meanwhile, halve tomatoes. Halve and pit avocado; slice thinly while still in skin, then scoop out with a spoon.
To serve, divide cauliflower rice mixture between bowls or plates and top with grated cheese, tomatoes, and avocado. Garnish with lime wedges and enjoy!