Start by cleaning your smoker and preheating it to 225 degrees F.
In a bowl, mix the ground beef with salt and pepper, adding onion and garlic flakes if you prefer.
Shape the beef into 3 equal portions, forming patties about 5-6 ounces each and 3/4 inch thick.
Make the patties slightly larger than your buns, as they will shrink during cooking. Use your thumb to create a small dimple in the center of each patty to ensure even cooking.
Sprinkle a bit more salt and pepper on the patties.
Place the patties in the smoker for about 40-55 minutes, or until they reach an internal temperature that is 10-15 degrees below your target temperature.
Increase the smoker's temperature to high and sear the burgers for 1-2 minutes per side, or use a gas grill for this step if preferred.
For cheeseburgers, add cheese during the last 10 minutes of smoking, or place it on the patty after searing.
Remove the burgers from the grill and let them rest for at least 5 minutes to keep them juicy.
Assemble your burger with your choice of bun or lettuce wrap, adding burger sauce, tomatoes, lettuce, and onions as desired.