If using spaghetti squash, follow the link in the blog post to prepare. Otherwise, start a pot of water to boil spaghetti.
Heat olive oil in a large pan and add chicken (you can season the chicken with salt and pepper before hand), along with the crushed garlic and cook until no longer pink.
Add tomatoes and spinach and cook until the spinach has wilted - about 2-3 minutes.
Add marina sauce, basil and crushed red pepper flakes. Stir until the ingredients are fully mixed.
That's it! Serve over spaghetti squash or spaghetti noodles (really, any noodles would work with this recipe!