In a medium bowl mix the cream of chicken soup, sour cream, broth, veggies, chicken, garlic and rosemary until well combined.
Pour this mixture into the deep dish pie shell.
Crush the Ritz crackers into crumbs. Melt the butter and then mix it with the cracker crumbs.
Pour the crumbs over top of the pie and use a knife to spread the evenly over the pie.
Bake at 350 degrees F until the top is brown and the filling is bubbly, about 35-45 minutes.