Heat oven to 350ºF. Spray 13×9-inch baking dish with no-stick cooking spray; set aside.
Cook sausage in 12-inch skillet over medium-high heat, stirring occasionally, 5-7 minutes or until cooked through and broken into crumbles.
Transfer to bowl, using slotted spoon. Cover; keep warm. Wipe out skillet.
Melt butter in same skillet until sizzling. Add garlic; sauté 1 minute.
Add beaten eggs and pepper; cook over medium heat, lifting egg mixture slightly with spatula to allow uncooked portion to flow underneath, 3-4 minutes or until eggs are almost set.
Spread half of chips in thin layer in bottom of prepared pan.
Top chips with half of sausage and 1 cup cheese.
Repeat with remaining chips, sausage, scrambled eggs, tomato and remaining cheese. Sprinkle with jalapeño slices.
Bake 6-7 minutes or until cheese is melted. Serve immediately with sour cream and salsa, if desired.