Ingredients

Cooking spray
1 pound extra-lean ground sirloin or ground buffalo (bison)
1/2 teaspoon salt
1/4 teaspoon ground black pepper
4 1-inch cubes Gorgonzola or any blue cheese (about 4 ounces total)
1 cup plain nonfat yogurt
1/4 cup shredded cucumber
2 teaspoons chopped fresh dill
1 teaspoon Dijon mustard
1 teaspoon garlic powder
4 whole-wheat rolls