1. Start by preheating your oven to 375°F (190°C). This recipe finishes in the oven for a juicy, tender finish, much like the way my mum taught me to slow-cook stews until they were fall-apart perfect.
2. In a small bowl, combine the cumin, smoked paprika, chili powder, garlic powder, onion powder, salt, and pepper. Rub this spice mixture evenly over both sides of each chicken breast.
3. Heat the olive oil in a large oven-proof skillet over medium-high heat. When the oil is shimmering, add the chicken breasts. Sear for about 4 minutes on each side until golden brown but not fully cooked through. This step locks in the juices, just like painting a memory with each flip of the pan.
4. Remove the chicken from the skillet and set aside on a plate. Lower the heat to medium and add butter to the same skillet. Once melted, sprinkle the flour over the butter and whisk together to form a roux. Cook for about 1-2 minutes until it bubbles gently and smells nutty — this is the base for our cheese sauce.
5. Slowly pour in the milk or half-and-half while whisking constantly to avoid lumps. Continue to cook and whisk until the sauce thickens, about 3-5 minutes. Patience here is key—just like folding flour into batter, the slow build of sauce texture is part of the magic.
6. Remove the skillet from heat and stir in the shredded cheddar and Monterey Jack cheese until melted and smooth. If using, fold in the diced green chilies for a subtle heat.
7. Return the seared chicken breasts to the skillet, spooning some cheese sauce over the top. Transfer the skillet to the preheated oven and bake for 12-15 minutes, or until the chicken is cooked through (internal temperature should reach 165°F/74°C).
8. Once out of the oven, squeeze fresh lime juice over the chicken and sprinkle with chopped cilantro. This final touch brightens the dish and adds a fresh contrast to the rich cheese sauce.

This recipe always feels like a little adventure in my kitchen, a blend of rustic and refined — much like the countryside I grew up in, where simplicity meets heart. The aromas that fill your home during the cooking process are a reminder of why I love food so much: it tells a story and brings people together.