In a large bowl, crack eggs and whisk together. Add seasonings and mix to combine
In a large skillet, heat oil to medium and pour in the eggs. Cook for 6 – 10 minutes, scrambling and chopping with spatula, until eggs are fully cooked.
Warm Mission tortillas until they are soft and pliable. Spoon in eggs. Add salsa, black beans, onion and cheese if desired.
Fold in the ends and wrap up the burritos! Arrange in a gallon freezer bag and store up to 2 months.
From frozen, preheat oven to 350 degrees and bake 35 minutes.