Optional toppings: lettuce leaves and tomato slices
4 hamburger buns, split
1 pound lean ground beef (90% lean)
1/4 tsp. dried sage leaves
1/2 tsp. dried rosemary, crushed
1/2 tsp. salt
2 tbsp. ketchup
3 tbsp. dry bread crumbs
2 green onions, thinly sliced
3 tsp. Dijon mustard, divided
2 tbsp. minced fresh parsley
2 tbsp. cream cheese, softened
1/4 cup shredded cheddar cheese