Creamy Swiss Chard

Name: Creamy Swiss Chard
Ingredients: 1 bunch red or rainbow swiss chard, rinsed and patted dry; 1/2 a medium red onion, diced; 1 clove of garlic, roughly chopped; 1 tablespoon dry sherry; 1 tablespoon butter; 1 heaping tablespoon flour; 1 cup milk; 1 pinch fresh grated nutmeg; 4 ounces Mixed grated cheese, I used monterey jack, cheddar and aged gouda