Grilled Salmon Salad with Blueberry Vinaigrette and Goat Cheese

olive oil, plus more for brushing baguette and oiling grates

honey

fresh blueberries, divided

white wine vinegar

Kosher salt and freshly ground pepper

salmon fillets (about 5-6 oz. each)

medium yellow onion, sliced into ½-thick slabs (rings intact)

demi baguette, thinly sliced on the bias

About 6-8 cups mixed salad greens

honeyed goat cheese