This really isn't a recipe, it's just our favorite way to prepare yellow squash.
Baked Yellow Squash with Onion
Cut the unpeeled yellow squash into 1/4 - 1/2" thick slices. Place in a single layer on a parchment paper lined baking sheet. Place sliced onions on top. Season as desired. Bake at 425 for 15 minutes. Flip then bake an additional 15 minutes or until tender.