"This is a healthy power burger for those that are working out/training and want to eat a great tasting burger and still feel good about it. This will help jump start your metabolism and feed your body the essential carbohydrates and protein it needs. Serve with a nice crisp salad or other healthy side found right here on this site!"
Preheat grill for medium heat and lightly oil the grate.
Whisk egg in a large bowl until uniform in color; add ground beef, oats, onion, spinach, cheese, salt, and ground black pepper and mix with your hands until well blended. Form the beef mixture into 4 patties.
Grill patties until bottoms are brown, about 5 minutes; flip and continue grilling until brown, about 5 minutes. An instant-read thermometer inserted into middle of burgers should read at least 160 degrees F (70 degrees C), about 5 minutes.