Heat a drizzle of oil in pan used for chicken over medium-high heat. Add onion and cook, stirring, until lightly browned and softened, 4-5 minutes. Stir in 1 TBSP butter until melted, then stir in flour and remaining Fry Seasoning. Cook for 1 minute. Gradually whisk in 1 cup water and stock concentrate. Reduce heat to medium and simmer until thickened, 2-3 minutes. Stir in peas, chicken, and carrot. Season with salt and pepper.