In a small bowl, combine the brown sugar, melted butter, lemon juice, dijon mustard, garlic powder, onion powder, salt, and dried thyme. Whisk together until completely combined.
⅓ cup brown sugar, 5 tablespoons salted butter, 2 tablespoons lemon juice, 1 ½ tablespoons dijon mustard, 1 ¼ teaspoons garlic powder, ¾ teaspoons onion powder, ½ teaspoon salt, ½ teaspoon dried thyme