Preheat your oven to 400 degrees. Cut the spaghetti squash in half and bake cut side down for 23-28 minutes (or until cooked through) I like to cook mine until al dente. Let the squash cool slightly and then, using a fork, scrape out the squash into a bowl and set aside.
Lower the oven temperature to 350 degrees.
Heat a large pan with a tablespoon of olive oil and sauté onions, red pepper, jalapeño and garlic. Continue to cook for another minute.
Add in the meat and taco seasonings. Ground the meat and continue to cook until fully cooked through.
Now, add in the diced green chilis, tomato paste, and salsa. Mix until fully incorporated.
Add in the cooked spaghetti squash (4 cups) and mix until fully combined.
Add the mixture into a casserole dish, top it with cheese (optional), and bake at 350 for 25 minutes.
Remove the dish from the oven and let it cool for a minute or two. Cut it into 6-8 servings and top it with shredded lettuce, cheddar cheese, sour cream, cilantro and salsa. Enjoy!