Whisk together brown sugar, paprika, black pepper, salt, garlic powder, onion powder, chili powder, and cayenne powder to make a seasoning rub for the ribs.
Trim the ribs of any excess fat and remove the membrane from the back of the rack. Rub generously with dry rub seasoning on both sides. Wrap the ribs in foil and refrigerate a minimum of 2 hours (optional: refrigerate over-night).
To make the Kansas City BBQ sauce, heat a medium saucepan over medium heat. Melt the butter then add the onion and cook about 5 minutes. Add the garlic and cook until fragrant, about another minute.
Whisk in ketchup, molasses, brown sugar, vinegar, mustard, chili powder, black and cayenne pepper to butter mixture. Bring the saucepan to a boil, then reduce the heat to low and simmer about 30 minutes or until thickened. Be sure to stir frequently. Blend with a hand mixer, if needed, to ensure a smooth sauce.
For low and slow ribs, preheat the grill to 225 degrees F. Place ribs bone side down and cook for 4-5 hours, basting the ribs in the last hour with the barbecue sauce.
For a quicker cook time, preheat the grill to medium or 325-350 degrees F. Place ribs bone side down and good 2.5 - 3 hours, basting the ribs in the last hour with the barbeque sauce.
In a medium frying pan over medium-high heat, cook bacon, turning slices as needed, until browned on both sides and crisp. Transfer to paper towels to drain. When cool enough to handle, crumble bacon.
Cut each egg in half lengthwise; gently scoop out yolks and place in a bowl. Mash yolks with a fork, then stir in mayonnaise, green onions, mustard, and crumbled bacon until well blended. Add salt and pepper to taste.
Spoon or pipe about 1 tablespoon yolk mixture into the hollow of each egg-white half. Serve immediately or cover and chill up to 4 hours.