Heat 1 teaspoon olive oil and 1 tablespoons butter in a large non-stick skillet over high heat.
When the butter is melted, add 1 pound boneless skinless chicken thighs. Sprinkle with salt and pepper, then cook until it changes from pink to white and starts to brown.
Add the remaining 2 tablespoons butter, 2 1/2 tablespoons honey, 1 large clove garlic, and 1 1/2 tablespoons apple cider vinegar. Bring to a simmer. Turn the chicken to coat in the sauce until it is golden and caramelized.
Once the chicken is browned all over, remove it from the heat. Pile chicken onto mashed potatoes, and drizzle with the sauce in the pan. Garnish with fresh parsley if desired.
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Notes
Extra Sauce: Double the sauce ingredients if you'd like extra for drizzling over mashed potatoes or rice. Remove the chicken and simmer the sauce for 1 to 2 minutes to thicken before serving.
Scaling: Double the recipe using a very large skillet, or cook the chicken in batches so it browns rather than steams.
Oven Method: Bake the chicken at 425°F until the internal temperature reaches 165°F, then toss it with the honey butter sauce before serving.