How to Make It
Heat a large nonstick skillet over medium-high heat. Add oil to pan. Add sausage, onion, and jalapeño; cook 5 minutes, stirring frequently. Combine eggs, water, and black pepper, stirring with a whisk. Add egg mixture to pan; cook 1 1/2 minutes, stirring frequently.
Place half a muffin on each of 4 plates. Top muffins evenly with egg mixture. Sprinkle evenly with tomato, cilantro, and cheese. Serve immediately.