Spicy Chicken Tacos

Preheat oven to 300°F. Wrap tortillas in foil and bake until heated through, 10 to 15 minutes.

Meanwhile, season chicken with salt. Heat 1 teaspoon oil in a large heavy skillet over high heat until very hot. Add chicken and cook, stirring until browned on all sides, about 6 minutes. Transfer to a bowl.

Reduce heat to medium and add the remaining 1 teaspoon oil to skillet. Add onion and cook, stirring, until starting to brown around the edges, 3 to 5 minutes. Add bell pepper, garlic, jalapeño and cumin. Cook, stirring, until the peppers are bright green but still crisp, 2 to 3 minutes more.

Stir in salsa and the reserved chicken. Cook, stirring, until the chicken is heated through, about 2 minutes. Remove from heat and stir in cilantro. Spoon into the warmed tortillas. Garnish with scallions, tomatoes and sour cream, if desired.