Slow Cooker Creamy Tuscan Chicken

Chicken Breasts, cut into bite-size pieces ((about 1 1/2 - 1 3/4 lbs.))

Garlic Cloves, finely diced ((or 1/2 teaspoon Garlic Powder))

Pepper

Chicken Broth ((plus more to thin sauce, if desired))

Sundried Tomatoes, chopped ((from a jar in oil, drain oil before adding))

Butter

large Onion ((finely diced))

Mushrooms ((sliced))

Prosciutto ((chopped))

Cream Cheese, softened

Parmesan Cheese, grated

Salt ((to taste))

Fresh Basil