Step 1

Mix brown sugar, chili powder, salt, pepper, garlic powder, and onion powder in a small bowl. Rub each rib with dry rub mixture until thoroughly coated. Let rest for 10 minutes.

Step 2

Mix BBQ sauce and liquid smoke until well combined.

Step 3

Place ribs in the slow cooker and pour BBQ sauce mixture evenly over ribs.

Step 4

Cook on Low until ribs are tender, 4 to 6 hours.

Step 5

Set an oven rack about 6 inches from the heat source and preheat the oven's broiler.

Step 6

Remove ribs from the slow cooker and baste with remaining BBQ sauce.

Step 7

Broil ribs in the preheated oven for 3 to 5 minutes on each side.