Match the job: for roasting, pick a squash-type substitute; for a quick tender-crisp, use zucchini; for baking-style softness, use sweet potato.
Use the listed ratio and cut size to mimic delicata’s cook time—smaller pieces cook faster and stay less watery.
Season to compensate for differences: squash swaps typically need a little extra salt to pop, while zucchini needs stronger seasoning to avoid tasting bland.
Cook until the substitute matches delicata’s texture: browned edges for roasted wedges/cubes, and fork-tender centers for creamy varieties.
Taste at the end and adjust with acid or sweetness (a squeeze of lemon or a touch of honey) if the swap tastes flatter than delicata.