Preparation Steps

• Preheat oven to 375°F (190°C). Grease a 9x13 inch baking dish.
• Arrange the sliced potatoes in a single layer in the prepared baking dish.
• In a medium saucepan, melt butter over medium heat. Whisk in flour and cook for 1 minute.
• Gradually whisk in milk until smooth. Bring to a simmer, stirring constantly, until thickened.
• Stir in salt, pepper, 1 cup of cheddar cheese, and 0.5 cup of mozzarella cheese until melted.
• Pour the cheese sauce evenly over the potatoes.
• Cover the dish with foil and bake for 30 minutes.
• Add the broccoli florets on top of the potatoes. Sprinkle with the remaining 1 cup cheddar cheese and 0.5 cup mozzarella cheese.
• Cover again and bake for another 15 minutes, or until potatoes are tender and cheese is melted and bubbly.
• Remove foil and bake for an additional 5-10 minutes, or until the top is golden brown.
• Let stand for 5 minutes before serving.