Pour diced or crushed tomatoes into the slow cooker. Add the basil, salt, and. Stir to mix well.
Cut spaghetti squash in half crosswise and scoop out the seeds. Add spaghetti squash to the slow cooker, hole side down.
Season the chicken evenly with the basil, salt, garlic powder, onion powder, and pepper. Add the seasoned chicken to the slow cooker around the spaghetti squash. It’s okay with all of the chicken is not fully emerged in the tomato sauce.
Cook HIGH 2-3 hours or LOW 4-6.
The spaghetti squash will be hot so carefully remove it using tongs.
Let the squash cool then rake a fork back and forth across the squash to remove its flesh into spaghetti-like strands.
Serve with the chicken and tomato sauce on top.
