Comforting Beef & Cabbage Hash | Command Cooking

Ingredients

• 2 tablespoons olive oil, plus more, to taste, for greasing the dish
• 1 medium onion, chopped
• salt, to taste
• pepper, to taste
• 8 ounces leftover or deli corned beef, excess fat discarded and thinly sliced crosswise
• 1 clove garlic, finely chopped
• 1 wedge cabbage, cooked and thinly sliced crosswise
• 1/2 cup parsley, chopped, plus more, to taste, for garnish
• 1 cup heavy cream
• 1 tablespoon Dijon mustard
• 2 medium russet potatoes, thinly sliced
• 2 cups Gruyère cheese, coarsely grated, divided