In a small bowl, whisk together the brown sugar, soy sauce, Gochujang, ketchup, garlic, ginger, onion powder, and pepper until well combined.
1/3 cup brown sugar, 1/4 cup low sodium soy sauce, 2 tablespoons Gochujang, 2 tablespoons ketchup, 2 cloves garlic, 1 teaspoon fresh ginger, 1 teaspoon onion powder, 1/4 teaspoon pepper