Cut the onion into small cubes and sweat in a little oil in a large pan. Deglaze with the cream (one third of the cream can also be replaced with milk).
Add the creamed spinach and first defrost on a medium heat and then briefly bring to a simmer. Then add the tortellini, stir, season with pepper, salt and nutmeg and mix in the pumpkin seeds.
Then put everything in a large baking dish and sprinkle the grated cheese over it.
Tip: You can of course use other cheese instead of Emmentaler, but I like the casserole with Emmentaler best.
Bake the casserole in the oven at 160 ° C for about 30 minutes (the cheese should be golden yellow).