First, prepare the mashed potatoes by peeling and chopping the medium russet potatoes. Place the chopped potatoes into a large pot of boiling water. Cook until the potatoes are tender, which should take about 20 minutes. You'll know they are ready when you can easily pierce them with a fork. Once cooked, drain the water from the potatoes.
Add the butter, salt, and milk to the drained potatoes. Using a handheld mixer, mix well until you achieve a smooth and creamy texture. This will ensure your mashed potatoes have a rich flavor and a velvety mouthfeel.
For the casserole, heat a skillet over medium heat and add the ground beef. Season it with black pepper, garlic powder, and oregano. Cook the beef until it is nicely browned and crumbled, ensuring it is no longer pink. This should take about 8 to 10 minutes.
While the beef is cooking, grate the cheddar cheese and set it aside for later. The cheese will add a deliciously creamy finish once melted on top of the pie.
Once the beef is cooked, preheat your oven to 350 degrees Fahrenheit. This step is crucial for achieving a nice golden-brown topping.
In a 2-quart dish, layer the cooked ground beef across the bottom. Make sure to spread it evenly so every bite has that delicious meaty flavor.
Next, sprinkle the seasoned salt evenly over the beef to enhance the flavors.
Drain and rinse the corn and green beans. Layer these vegetables over the beef, ensuring to sprinkle a little more seasoned salt on top for added flavor.
Now, add a generous layer of the creamy mashed potatoes on top of the vegetables. Spread it evenly with a spatula to cover the filling completely.
Finally, sprinkle the grated cheddar cheese over the mashed potato layer and give it a light sprinkle of seasoned salt for good measure.
Cover the dish with aluminum foil and bake in the preheated oven for about 20 to 25 minutes. You'll know it's done when everything is heated through and the cheese is bubbling. Once done, allow it to cool for about 5 minutes before slicing into 6 to 8 servings.
Serve each slice with refreshing cantaloupe slices on the side for a lovely balance of flavors.
