01 - Whisk together large eggs, low-fat milk, salt, and black pepper in a small mixing bowl until fully combined and slightly frothy.
02 - Heat a non-stick skillet over medium heat. Lightly coat the surface with olive oil or cooking spray. Pour in the egg mixture and scramble gently with a spatula, pushing eggs across the pan until just set but still moist, approximately 2-3 minutes.
03 - Lay toasted English muffin halves on a clean work surface. Spread Greek yogurt or hummus on the cut side of each bottom muffin half if desired for added creaminess.
04 - Layer baby spinach leaves on the bottom muffin halves, followed by the warm scrambled eggs. Top with a slice of reduced-fat cheese, fresh tomato slices, and avocado slices.
05 - Place the remaining muffin halves on top and press down gently to secure the layers. Serve immediately while warm, or wrap tightly in parchment paper for an on-the-go breakfast.