1. Whisk the first 5 ingredients (through pepper) in a medium bowl.
2. Coat a medium nonstick skillet with cooking spray, and melt butter over medium heat. Add the egg mixture, and stir with a heatproof rubber spatula to scramble.
3. Sprinkle 2 tablespoons cheese down the center of one tortilla; top with half of the scrambled egg, 2 tablespoons tomato, and 1 tablespoon chunky salsa.
4. Roll up burrito-style (fold bottom up and sides to center). Repeat with remaining ingredients.