Had this for the first time and the flavors were bomb!

4 large russet potatoes, peeled and thinly sliced
2 cups fresh or frozen sweet corn kernels
1 medium onion, finely chopped
2 cloves garlic, minced
2 cups heavy cream
1 cup grated cheddar cheese
1/2 cup grated Parmesan cheese
2 tablespoons unsalted butter
Salt and pepper to taste
2 tablespoons chopped fresh parsley (optional)