Scrambled Egg Tostada

In a small skillet, toast both sides of 1 corn tortilla over medium heat until crisp; set aside. Coat skillet with nonstick cooking spray and scramble 1 egg. Spread tortilla with 1/2 cup warmed fat-free refried black beans and top with scrambled egg, 2 tablespoons salsa, and 1/4 avocado, sliced.