Prep the veg. Dice the bell pepper, onion, and tomato.
Chop the spinach and cilantro. Set everything in small bowls so you can build quickly.
Warm the tortillas. Heat a dry skillet over medium heat. Warm each tortilla for 20–30 seconds per side until soft and pliable.
Keep them wrapped in a clean towel.
Sauté the aromatics. Add the oil to the skillet. Toss in the onion and bell pepper with a pinch of salt. Cook 3–4 minutes, until softened and lightly golden.
Add spinach and spices. Stir in the spinach, cumin, and chili powder.
Cook 30–60 seconds, just until the spinach wilts and the spices are fragrant.
Scramble the egg whites. Reduce the heat to medium-low. Pour in the egg whites. Season with salt and pepper.
Use a silicone spatula to gently push the whites from the edges toward the center, forming soft curds. Cook 2–3 minutes until just set but still glossy.
Finish with cheese (optional). Sprinkle cheese over the eggs and let it melt for 30 seconds. Remove from heat so the eggs don’t dry out.
Assemble the tacos. Divide the egg mixture among the warm tortillas.
Top with tomato or pico, avocado, cilantro, and a squeeze of lime. Add salsa or hot sauce to taste.
Serve right away. Egg whites cool quickly, so enjoy them warm for the best texture.