Ingredients:
1 tablespoon canola oil
12 ounces ground turkey breast
2 cups thinly sliced kale
1 cup chopped onion
1 tablespoon chopped fresh thyme
1 teaspoon garlic powder
4 ounces presliced mushrooms
1 1/2 cups 2% reduced-fat milk
1 1/2 tablespoons all-purpose flour
3 ounces Swiss cheese, shredded (about 3/4 cup)
3/4 teaspoon black pepper
1/2 teaspoon kosher salt
4 whole-wheat hamburger buns