In a large skillet over medium heat, heat oil until shimmering. Add onion, garlic, & a generous pinch of salt & cook, stirring occasionally, until onion is translucent, about 5 minutes. Add zucchini & sauté for another 5 minutes. Stir in Boursin cheese, parmesan & dill. Cook, stirring frequently, until cheeses are melted & combined, about 2 minutes. Stir in panko breadcrumbs & Old Bay seasoning. Cook, stirring, until mixture is thickened, about 2 minutes more; season with salt & pepper to taste.