A comforting and flavorful casserole combining sweet onions and creamy mashed potatoes, topped with gooey cheese.
Slice the sweet onions into thin rings.
Use a sharp knife to ensure even slices, which will cook uniformly.
Melt the butter in a skillet over medium heat.
Ensure the butter doesn't brown; adjust the heat if necessary.
Add the onion rings to the skillet and cook, stirring occasionally, until caramelized and golden brown, about 10 minutes.
Stir occasionally to prevent burning and ensure even caramelization.
In a mixing bowl, combine the mashed potatoes and caramelized onions.
Mix gently to maintain the texture of the mashed potatoes.
Transfer the mixture to a baking dish and spread evenly.
Use a spatula to smooth the top for even baking.
Sprinkle the shredded cheddar cheese evenly over the top.
For a golden crust, use a mix of cheddar and Parmesan cheese.
Bake in a preheated oven at 350°F for 20 minutes, or until the cheese is melted and bubbly.
Place the dish in the center of the oven for even cooking.
Serve warm and enjoy your cheesy onion and potato casserole.
Garnish with chopped parsley for a fresh touch.