01 - Preheat oven to 350°F (175°C). Generously grease a 12-cup muffin tin or insert parchment liners.
02 - Boil elbow macaroni in salted water per package guidelines until al dente. Drain thoroughly and allow to cool.
03 - In a large mixing bowl, whisk eggs, whole milk, sour cream, chili powder, cumin, paprika, garlic powder, salt, and black pepper. Blend in shredded cheddar and grated Parmesan.
04 - Fold cooked macaroni, red bell pepper, corn, red onion, and half the green onions into the egg mixture.
05 - Spoon the prepared mixture evenly into each muffin cup, filling each about three-quarters full.
06 - Place in the preheated oven and bake for 22 to 25 minutes until set and surface turns golden.
07 - Allow muffins to rest in the tin for 5 minutes. Run a knife gently around edges to loosen. Garnish with salsa, cilantro, remaining green onions, and jalapeño slices if desired. Serve warm.