Broccoli-Cheddar Hash-Brown Casserole

Name: Broccoli-Cheddar Hash-Brown Casserole
Prep time: 40 min
Total time: 40 min
Cuisine: American
Ingredients: 4 medium russet potatoes (about 2 ½ pounds total); Kosher salt and freshly ground pepper; 2.5 cups shredded sharp cheddar (8 ounces); 4 teaspoons Dijon mustard; 0.5 cup Greek yogurt, plus more for serving; 0.5 cup sliced scallions (from about 4), plus more for serving; 4 cups broccoli florets, cut into bite-size pieces; 5 large eggs, lightly beaten; 8 ounces bacon (about 8 slices); 2 tablespoons unsalted butter