- Pre-heat oven to 400 degrees. Spray a large baking sheet with non-stick cooking spray. 
- Cut the ends of the potatoes off and discard. Cut the rest of the potatoes into 1/2 inch slices. 
- Brush both sides pf the potato slices with the melted butter and sprinkle with salt and pepper. 
- Place on baking sheet and bake for 30 to 40 minutes, or until lightly browned. Flip the potato rounds over about halfway through cooking time (15-20 minutes) to brown the other side. 
- When potato rounds are done, top with cheese, bacon and green onions. 
- Pop the baking sheet back into the oven for 3-5 minutes, or until the cheese is melted. 
- Top with a small amount of sour cream, if desired. Serve immediately.