Meanwhile, place chicken in a medium bowl and pat dry with paper towels. Toss with a drizzle of oil, Southwest Spice, salt, and pepper. Add chicken and scallion whites to pan with poblano. Cook, stirring, until chicken is browned and cooked through, 4-6 minutes. Stir in a quarter of the salsa; taste and season with salt and pepper. Turn off heat; transfer to a separate medium bowl. Wipe out pan.