Prep the base: Rinse and chop your greens. Halve tomatoes, slice avocado, and set out toppings so assembly is quick.
Cook the aromatics: Heat a large skillet over medium.
If using lean beef, add olive oil. Sauté the onion for 3–4 minutes until softened. Stir in garlic and cook 30 seconds.
Brown the beef: Add ground beef to the skillet.
Break it up with a spatula and cook until no longer pink, about 6–8 minutes. Drain excess fat if needed.
Season it up: Stir in salt, pepper, chili powder, cumin, smoked paprika, oregano, and red pepper flakes. Cook 1 minute to bloom the spices.
Add tomato paste and liquid: Mix in tomato paste and beef broth (or water).
Simmer 2–3 minutes, stirring, until slightly thick and glossy. Taste and adjust seasoning.
Build your bowls: Divide greens into bowls. Top with taco beef, tomatoes, avocado, and cheese.
Finish with toppings: Add sour cream, salsa, cilantro, and a squeeze of lime.
Include any optional add-ins you like.
Serve: Enjoy right away while the beef is hot and the greens are crisp.