Parboil or microwave the baby potatoes until cooked through. This step can be done ahead of time.
On the griddle over low heat, cook the bacon pieces slowly to render the fat. Once crispy, remove the bacon and set aside, leaving the bacon fat on the griddle.
Add half the butter to the griddle and let it melt into the bacon fat. Add the cooked potatoes and toss to coat in the butter-fat mixture. Using a burger smasher and parchment paper, press down to flatten each potato. Cook the smashed potatoes on both sides until crispy and warmed through. Add the remaining butter as needed and season with Blackstone Chicken Griddle seasoning.
Top each potato with shredded cheddar cheese, cooked bacon, and green onions.
Serve family-style with sour cream on the side for dipping or topping.