Pat the country style ribs dry with paper towels and trim any large pieces of excess fat if desired.

Lightly spray the inside of the slow cooker with nonstick cooking spray or use a slow cooker liner.

In a small bowl, stir together the barbecue sauce and brown sugar until well combined and glossy.

Spread a thin layer of the barbecue sauce mixture on the bottom of the slow cooker.

Arrange the ribs in an even layer inside the slow cooker, overlapping slightly if necessary.

Pour the remaining sauce mixture over the ribs and turn them with tongs to coat evenly.

Cover and cook on LOW for 7–8 hours or HIGH for 3 1/2–4 hours until the ribs are very tender.

Preheat the oven broiler and line baking sheets with aluminum foil.

Transfer the ribs to the prepared baking sheets, letting excess liquid drip off slightly while keeping them coated with sauce.

Brush or spoon additional sauce from the slow cooker over the ribs.

Broil for 3–5 minutes until the sauce becomes bubbly and lightly charred.

Remove from the oven, let rest for a few minutes, and spoon any extra sauce from the tray over the ribs before serving.