Toast one slice of whole wheat bread. Mash 1/4 of an avocado. Add about 2-3 tablespoons of non-fat plain Greek yogurt to the mashed avocado and mix well. Squeeze in some lemon juice, then season with salt, pepper, and chili flakes. Top the toasted bread with the avocado mixture, then place a poached egg on top. Finish with more pepper and chili flakes.