Savory Sweet Potato Casserole | Mama's Cooking

Ingredients

• 6 cups mashed cooked sweet potatoes, (about 4-5 large potatoes)
• 1 tablespoon oil
• 4-5 slices ham, cooked and chopped into small pieces
• 1 large onion, thinly sliced
• 1 teaspoon thyme
• 1 teaspoon marjoram
• 4 tablespoons unsalted butter, melted
• 1 1/2 cups Swiss or Gruyère cheese, shredded, divided
• 1/2 cup heavy cream
• 1 large egg
• 1 1/2 teaspoons salt
• 1/4 teaspoon ground black pepper