Add the garlic and leek to the bottom of the slow cooker.
In a plastic baggie, add the chicken breasts, arrowroot powder, and salt. Toss until chicken is coated.
Add the chicken broth and coconut milk to the slow cooker and whisk until combined.
Dump in the chicken breasts chunks and top with basil and sundried tomatoes.
Cook on low for 4-6 hours (see notes).
When ready, serve the Tuscan chicken on top of rice, noodles or spaghetti squash by placing half a cup of spinach on top of the base and topping with the chicken mixture.
