01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or foil for easy cleanup.
02 - Combine barbecue sauce, reserved pineapple juice, brown sugar, soy sauce, Dijon mustard, garlic powder, and black pepper in a small saucepan over medium heat. Stir and simmer for 3-4 minutes until slightly thickened. Remove from heat.
03 - Arrange kielbasa slices and pineapple chunks in a single layer on the prepared baking sheet.
04 - Brush generously with the prepared glaze, reserving about one-third for later use.
05 - Bake for 10 minutes, then flip each piece using tongs.
06 - Brush again with more glaze and bake for another 8-10 minutes until caramelized and heated through.
07 - Thread each kielbasa slice and pineapple chunk onto toothpicks for serving. Drizzle with remaining glaze and serve warm.