In same Dutch oven, heat 2 1/2 cups of the broth to boiling over medium-high heat. In small bowl, mix remaining 1/2 cup broth and the flour until smooth. Stir flour mixture into boiling broth. Cook, stirring constantly, until bubbly and thickened. Stir in rosemary, salt and pepper. Pour over beef mixture; stir until well blended. Sprinkle with croutons, then cheese.