1. Place oats in foodsafe plastic bag. Seal bag securely, squeezing out excess air. Roll over bag with rolling pin to crush oats to a fine consistency.
2. Combine Ground Beef, oats, and steak seasoning blend in large bowl, mixing lightly but thoroughly. Lightly shape into four 1/2-inch patties.
3. Place patties on grid over medium, ash-covered coals. Grill, covered, 8 to 10 minutes (over medium heat on preheated gas grill, 7 to 9 minutes) until instant-read thermometer inserted horizontally into center registers 160°F, turning occasionally.
4. Line bottom of each bun with lettuce and tomato, if desired; top with burger and cheese slice. Close sandwiches.
Test Kitchen Tips Cooking times are for fresh or thoroughly thawed Ground Beef. Color is not a reliable indicator of Ground Beef doneness.