Preheat oven to 375 degrees.

Halve the spaghetti squash lengthwise and remove seeds. Place, cut side down, on a baking sheet. (You will use all of a 2 1/2-3 pound squash.)

Bake in the oven for 45-50 minutes or till tender.   Use a fork to shred and separate the spaghetti squash into strands.

Meanwhile, for sauce, in a large skillet cook ground turkey, chopped onion, and minced garlic til meat is no longer pink and onion is tender.

Stir in 1/2 teaspoon of cornstarch. Stir in tomato sauce, tomato juice, corn, chili powder, and oregano.   Cook and stir till slightly thickened and bubbly. Cook and stir 2 minutes more.

To serve, spoon meat mixture over spaghetti squash and top with shredded cheese.