Gallery: The Food Lab Turbo: How To Make The Best Grilled Cheese Sandwich

Even golden brown crust, moist crumb, oozy core.

2 slices of hearty sandwich bread, 2 slices of American cheese, 2 tablespoons of butter, and some kosher salt. The cornerstones of a healthy diet.

Melt 1/3rd of your butter in a non-stick or cast iron pan over relatively low heat. Melted, not browned is what you're going for.

Toast your bread on one side until it's a pale golden brown, moving it around the skillet with your fingers so it cooks evenly.

Add your cheese slices to the bread, on the toasted side, and close your sandwich, toasted-side-in. This is key.

Close your sandwich, toasted-side-in. This is key.

Add another 1/3rd of the butter and melt it over low to medium-low heat.

Add your sandwich, swirl it around the pan to collect the butter, then cook low and slow, moving the sandwich around the pan and rotating it like a record every so often to get even color. This should take at least 5 minutes.

Remove the sandwich once one side is nicely golden brown, then melt the remaining butter.

Return the sandwich to the skillet, toasted-side-up, and season with a sprinkle of kosher salt. You can skip this step if you use salted butter. Continue cooking until the second side is deep golden brown.