You don’t have to brown the butter. The difference in flavor is subtle, and unbrowned butter will work just fine. However, as any great cook will tell you, little differences are what separates good dishes from gourmet dishes. Remember that there’s a fine line between browned and burnt butter, which is why we use a splash of olive oil to prevent burning. You can, if you prefer, simply melt butter, allowing it to foam, without browning it. 

If you can, shred the cheese yourself from a block rather than using store-bought pre-shaved cheese. It will taste better, melt easier, and blocks of cheese are typically of a higher quality than the pre-grated bags.

If you don’t have any Parmesan, that’s OK! You can substitute it for pecorino, or romano. Most of the salty, crumbly, hard Italian cheese have similar flavors and textures, but their depth of flavor varies based on region of origin and their aging period. 

You can use a classic four-cheese (look for quattro formaggio on the label) tortellini, to really make this an indulgent, cheesy treat. If you like, however, there are a variety of other tortellini you could try. Some have pumpkin, spinach, or even meat fillings, and they all work very well in this sauce.

You could use half and half rather than heavy cream for this recipe, too. It will make your sauce thinner, however. If that happens, add 1 tablespoon flour ( mixed with water).