Pre-heat oven to 400°F
Place squash halves on a parchment or silicon-lined baking sheet, flesh side down. Roast for 30 minutes. If you are working with a larger spaghetti squash, roast for 40.
While the squash roasts, in a medium-sized bowl, mix the yogurt, lemon juice, olive oil, grated parm, garlic powder, onion powder, salt, artichoke hearts, spinach, and ¼ cup of cheddar.
Fill the roasted squash with the artichoke-spinach mixture, top with cheddar, and bake for an additional 10 minutes.
