In a small saucepan, heat 1 tsp oil or butter over medium heat. Add the minced garlic and sauté until it just begins to brown, about 30–60 seconds, being careful not to burn it.
Add ketchup, honey, Worcestershire sauce, hot sauce, 1/2 tbsp black pepper, dark brown sugar, and lemon juice to the pan. Stir to combine.
Bring the sauce to a gentle simmer over medium-low heat and cook, stirring occasionally, for 10–15 minutes until hot and slightly thickened. Keep warm until ready to use.
Meanwhile, pat the chicken thighs dry, coat them with the avocado oil, and season evenly with salt, 1/2 tsp black pepper, and garlic powder.
Preheat your grill or grill pan to medium-high heat. Place the chicken on the hot surface and sear until golden brown on the first side, then flip and brown the other side.
When chicken reaches about 155°F internal temperature, brush a generous layer of the honey BBQ sauce onto the top, flip to caramelize, brush the other side, and repeat as needed until the internal temperature reaches 165°F.
Remove the chicken when fully cooked and let rest briefly. Serve warm with extra BBQ sauce on the side if desired.