First, we'll start with the spaghetti squash. Preheat your oven to 400°F.
Cut your spaghetti squash in half and use a spoon to remove the seeds from the center. Spray the squash with cooking spray or brush with olive oil.
Season with salt and pepper and place face down on a baking sheet. Bake for 30-40 minutes or until the squash can be shredded with a fork.
Next, let's prepare the meatballs. In a mixing bowl, combine ground turkey, panko crumbs, 1/4 cup feta cheese, egg, onion, tarragon, balsamic vinegar, Dijon mustard, red pepper flakes, salt, and pepper.
Use a cookie scoop to scoop meatballs and place onto a greased skillet.
Heat skillet over medium-heat and let the meatballs brown on each side, about 5-8 minutes. Then, add diced tomatoes and tomato sauce.
Stir meatballs so they're all covered in sauce.
Cover skillet with a lid and let the meatballs simmer for 15-20 minutes. The internal temperature of the meatballs should be 165°F.
When meatballs are done cooking, garnish with the rest of the crumbled feta cheese and more tarragon.
Place your meatballs over the shredded spaghetti squash (or noodles of choice) and enjoy!