Gluten Free Stuffing

Name: Gluten-Free Stuffing
Ingredients: 1 pound gluten-free white sandwich bread; 2 medium yellow onions; 4 medium stalks celery; 6 cloves garlic; 2 sticks (8 ounces) unsalted butter, divided; 2 teaspoons kosher salt, divided; 2/3 cup loosely packed fresh parsley leaves; 1/4 cup loosely packed fresh sage leaves; 3 tablespoons fresh rosemary leaves; 2 tablespoons fresh thyme leaves; 2 1/2 cups low-sodium chicken broth, divided; 2 large eggs; 1 teaspoon freshly ground black pepper