Peel the red onions and cut them into thick slices or rings.
In a bowl, combine the olive oil, BBQ sauce, brown sugar, balsamic vinegar, garlic powder, smoked paprika, salt, and pepper.
Toss the onion slices in the BBQ spice mixture to coat them evenly.
Preheat your grill to medium heat, or use a grill pan.
Place the onion slices on the grill rack and cook for 5-7 minutes per side, until softened and caramelized.
Before serving, drizzle with a little extra BBQ sauce and serve with grilled meats, burgers, or sandwiches.
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