Preheat oven to 400°; pat fish dry, line a sheet pan with foil + oil the foil, coat fish in vinaigrette, season with salt + pep; bake 10-12 min until firm, opaque + cooked through

Cut onion in half from root to stem, peel + thinly slice ½ of onion

Slice asparagus into ½-inch pieces, keeping tips whole; heat 1 tbsp oil in skillet over med-high, add asparagus + onions with salt/pep + half the seasoning blend; sauté 4-6 min until onions are tender + asparagus is bright green

Divide fish + veggies to plates-Bon Appetit!