Prep Time: 10 minutes
Cook Time: 10 minutes
Total Time: 20 minutes
Servings: 4
Spray burgers with a light coat of cooking spray. Grill or pan sear over high heat 3 minutes per side. Cook additional 5-8 minutes at 375°F to desired doneness of at least 160°F. Remove from grill and rest at least 3 minutes for cheese to set.
Melt butter in skillet over medium heat, add onions. Cook, stirring occasionally, for 5 minutes or until onions are caramelized. Season with salt and pepper, as desired.
Assemble with your favorite burger toppings.