Slow-Cooker Chicken Marsala

Whisk flour and 1/2 cup broth in a small bowl until smooth. Combine the flour mixture, mushrooms, shallots, Marsala, thyme and the remaining 1/2 cup broth in a 6-quart slow cooker. Arrange chicken in a single layer in the slow cooker; sprinkle with salt and pepper. Cover and cook on Low until an ins