Place Chicken, Potatoes, Onion, Garlic, Coconut Milk, Chicken Broth, Curry Powder, Salt, And Black Pepper In A Slow Cooker. Cook On Low For 4 Hours. Add Red Bell Pepper And Continue To Cook For 45 Minutes. Stir In Cornstarch And Cook Until Thickened, About 15 Minutes More. Sprinkle With Raisins And Coconut Flakes To Serve.