Meat and Potato Casserole with Mushrooms and Cheese

### Instructions:

#### Step 1: Prepare the Potatoes and Preheat the Oven
1. Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish with cooking spray or a little olive oil to prevent sticking.
2. Thinly slice the potatoes into rounds (about 1/8 inch thick) using a sharp knife or mandolin for even slices.

#### Step 2: Cook the Ground Meat
1. Heat the olive oil in a large skillet over medium heat. Add the ground beef (or turkey) and cook until browned, breaking it up with a spoon as it cooks, about 5-7 minutes.
2. Once the meat is browned, add the diced onion and minced garlic. Continue to cook for another 2-3 minutes, until the onion becomes translucent.
3. Stir in the sliced mushrooms and cook for an additional 3-4 minutes, allowing the mushrooms to release their moisture and soften.
4. Season the mixture with dried thyme (or Italian seasoning), salt, and pepper. Remove from heat and set aside.

#### Step 3: Assemble the Casserole
1. In a large mixing bowl, combine the sour cream (or Greek yogurt) and milk. Stir until smooth to create a creamy base for the casserole.
2. Layer half of the sliced potatoes in the bottom of the prepared baking dish, slightly overlapping them.
3. Spread half of the meat and mushroom mixture over the potatoes, followed by half of the shredded cheese.
4. Repeat the layers with the remaining potatoes, meat mixture, and cheese, ensuring that the top layer is cheese.
5. Pour the creamy sour cream and milk mixture over the top, gently pressing the potatoes down to soak in the liquid.

#### Step 4: Bake the Casserole
1. Cover the casserole dish with aluminum foil and bake in the preheated oven for 45 minutes. This allows the potatoes to cook through and soften.
2. After 45 minutes, remove the foil and bake for an additional 15-20 minutes, or until the top is golden and bubbly and the potatoes are tender when pierced with a fork.
3. For an extra crispy topping, you can sprinkle breadcrumbs over the top and drizzle with melted butter before the second round of baking. This will create a delicious, golden crunch.

#### Step 5: Serve and Enjoy
1. Let the casserole rest for 5-10 minutes after removing it from the oven. This will help it set and make serving easier.
2. Cut into squares and serve hot, perhaps with a side of fresh salad or steamed vegetables for a complete meal.

### Tips for a Perfect Meat and Potato Casserole:
– **Meat Options:** Feel free to swap the ground beef with ground turkey, chicken, or even pork if preferred. You can also add cooked sausage for more flavor.
– **Vegetable Variations:** For extra veggies, you can mix in frozen peas, corn, or even spinach. The mushrooms can be substituted with other vegetables like zucchini or bell peppers.
– **Cheese Variety:** For a different flavor profile, try using a combination of cheeses like gouda, parmesan, or Swiss to complement the richness of the meat and potatoes.
– **Make Ahead:** This casserole can be assembled a day in advance. Simply cover it and refrigerate until you’re ready to bake. You might need to add a few extra minutes to the baking time if it’s cold from the fridge.
– **Freezing:** Leftovers can be frozen for up to 2-3 months. Reheat in the oven at 350°F (175°C) for 25-30 minutes until heated through.

### Why You’ll Love This Meat and Potato Casserole with Mushrooms and Cheese:
– **Comfort Food at Its Best:** This casserole is the ultimate comfort food with its layers of tender potatoes, savory meat, and gooey cheese. It’s a dish that brings warmth and satisfaction to any meal.
– **Hearty and Filling:** This casserole is packed with protein and vegetables, making it a well-rounded meal that will leave everyone full and content.
– **Family-Friendly:** With its classic flavors and easy-to-prepare ingredients, this casserole is sure to be a hit with kids and adults alike.
– **Perfect for Leftovers:** It’s just as good the next day, making it ideal for meal prepping or enjoying leftovers throughout the week.

In conclusion, Meat and Potato Casserole with Mushrooms and Cheese is a timeless dish that combines all the flavors you love into one easy, baked meal. It’s a comforting, satisfying choice that’s perfect for family dinners or casual gatherings. This recipe will undoubtedly become a favorite in your recipe collection!