1. Lightly brush the oil on the bottom and up the sides of a 2-quart rectangular baking dish. Place tortillas in the bottom of the baking dish, overlapping and cutting to fit as necessary; set aside.
2. Combine the flour, chili powder, and salt. Sprinkle half of the flour mixture over tortillas. Combine tomatoes, salsa, green onions, and chopped jalapenos. Spoon over tortillas. Sprinkle with remaining flour mixture.
3. In a medium bowl combine the eggs, 1% lowfat milk, and spinach. Pour egg mixture evenly over the veggie mixture in baking dish. Bake, uncovered at 350 for 30 minutes. Sprinkle with cheese and bake 5 minutes more. Let stand for 10 minutes before serving. If desired, garnish with sliced jalapenos.