Mini Cheese and Turkey Melts

Ingredients 3 tablespoons unsalted butter 3 tablespoons all-purpose flour 1 ½ cups unsalted chicken broth ¼ teaspoon salt 2 teaspoons chopped fresh sage, divided 2 teaspoons chopped fresh thyme, divided 3 tablespoons extra-virgin olive oil, divided 1 large yellow onion, thinly sliced 1 (8 ounce) package sliced fresh cremini mushrooms 4 slices multigrain bread, toasted…