01 - Cook the fettuccine pasta in salted boiling water according to package instructions. Drain and set aside, reserving 1/2 cup pasta water for sauce adjustment.
02 - In a small bowl, mix chili powder, cumin, smoked paprika, garlic powder, salt, and black pepper. Rub this spice blend evenly over both sides of the chicken breasts.
03 - Heat olive oil in a large skillet over medium-high heat. Add chicken breasts and cook 5-7 minutes per side, or until cooked through and lightly charred. Remove from pan, let rest 5 minutes, then slice thinly.
04 - In the same skillet, add a drizzle of oil if needed. Sauté red onion, bell peppers, and jalapeño for 4-5 minutes until softened and slightly caramelized. Remove vegetables and set aside.
05 - Lower heat to medium. Add butter to the skillet. Once melted, add minced garlic and sauté for 30 seconds until fragrant, being careful not to burn.
06 - Pour in heavy cream and milk. Bring to a gentle simmer, whisking occasionally. Stir in Parmesan cheese, salt, black pepper, and chipotle powder. Cook until sauce is smooth and slightly thickened, 3-4 minutes.
07 - Add cooked pasta and reserved vegetables to the sauce, tossing to coat thoroughly. If sauce is too thick, add a splash of reserved pasta water to reach desired consistency.
08 - Squeeze in lime juice, then top with sliced chicken. Garnish generously with chopped cilantro and serve with extra lime wedges on the side.