Trim and cube 2 pounds boneless skinless chicken breasts into bite size pieces. Add the chicken into a 6-8 quart slow cooker.
Add in the diced 1/2 medium sweet onion and the minced 4 teaspoons minced garlic.
Pour in the 14 ounces full fat coconut milk, 15 ounces diced tomatoes, and 8 ounces tomato sauce. Stir in 2 tablespoons curry powder, 1 tablespoon granulated sugar, and 1 teaspoon salt.
Cover and let cook on low for 6 to 8 hours or high for 4 to 5 hours.