Creamy Chipotle Chicken Lettuce Cups (Under 300 Calories)

INGREDIENTS Serves 3 12 ounces shredded chicken breast 1 tablespoon coconut oil 1 cup whole milk 1 medium onion, diced 3 cloves of garlic, minced 1 teaspoon ground cumin 1 teaspoon dried oregano 1 canned chipotle pepper, minced ½ teaspoon salt 6 butter lettuce leaves Pico de gallo salsa