Add 2 teaspoons of olive oil to a small skillet and warm over medium heat. Next, add the mushrooms and sautee until they begin to brown at the edges (about 3 minutes). Set aside.
In a small bowl, combine the whole eggs and egg whites. Beat the eggs until well combined.
Chop the spinach and scallions, then add them to the egg mixture.
Put the pan with the mushrooms back over the heat and add the last teaspoon of olive oil. Pour the egg mixture over the mushrooms and scramble with a spatula. Once the eggs are cooked to your liking, turn off the heat.
Take 1 tortilla and spread 1/4 of the egg mixture inside. Top each burrito with 1 tablespoon of salsa, along with a few slices of avocado. If choosing to meal prep this recipe, leave the avocado out of the burrito and add it after reheating.