Corned Beef and Potato Bake With Hash Browns

Ingredients (11)

• 3 cups diced leftover corned beef
• 4 tablespoons butter (divided)
• 1 cup chopped onion
• 1/2 green bell pepper (chopped)
• 1/2 teaspoon dried leaf thyme
• 2 tablespoons spicy mustard (or grainy mustard)
• 16 to 24 ounces hash brown potatoes (thawed, about 5 to 6 cups)
• Kosher salt (to taste)
• Freshly ground black pepper (to taste)
• 1 1/2 cups shredded Swiss cheese
• 1 cup breadcrumbs (preferably rye bread)