01 -
Preheat the oven to 400°F (205°C). Halve the spaghetti squash and scoop out the seeds.
02 -
Brush cut sides with olive oil and roast face-down on a baking sheet for 35–40 minutes until tender.
03 -
Sauté onions in a skillet until softened, then add garlic for another minute.
04 -
Once cooled, shred the squash into strands using a fork.
05 -
Mix shredded squash with sautéed onions and garlic, Greek yogurt, 1 cup cheddar cheese, salt, and pepper.
06 -
Pour into a greased casserole dish and top with remaining cheese. Bake at 375°F (190°C) for 20–25 minutes until bubbly and golden.