Heat a large nonstick skillet over medium heat. Coat pan with cooking spray.
Add green onions to pan, and cook 2 minutes or until tender, stirring occasionally.
Remove from heat.
Place mashed potatoes in a medium bowl. Stir in onions, cheese, salt, pepper, and bacon. Divide potato mixture into 6 equal portions, shaping each into a 1/2-inch-thick patty.
Place panko in a shallow dish. Dredge patties in panko.
Place patties on a baking sheet coated with cooking spray.
Bake at 425 for 12 minutes. Carefully turn patties over; bake an additional 12 minutes or until golden.