1 tablespoon extra-virgin olive oil (divided)
2 pounds boneless skinless chicken breasts ((about 4 small/medium or 3 medium/large), cut in half if large)
2 teaspoons kosher salt (divided)
1/2 teaspoon black pepper
1 small yellow onion (or 1/2 large yellow onion, thinly sliced)
4 cloves garlic (minced)
2 teaspoons chili powder
3 chipotle peppers in adobo (individual peppers, NOT 3 cans, finely chopped (if you love heat, feel free to add an extra pepper or stir in a few teaspoons of sauce from the can))
1 can diced tomatoes in their juices ((14 ounces))
1/4 cup freshly squeezed lime juice (from about 1 medium lime)
1/4 teaspoon kosher salt
1/2 cup pineapple juice