Garlic butter sauce for spaghetti or other pasta is easy to make at home. The key to making a great sauce is in using real butter and garlic—this is one instance where substitutions do not work well. This sauce can be whipped up in minutes and served with pasta of any type. Or, try it over seafood or as a dipping sauce for vegetables.
Cook the spaghetti according to the instructions found on the package.
Heat a heavy or sauté skillet over medium-high heat. Add the olive oil and allow it to warm.
Place the garlic cloves into the hot oil and sauté for five to six minutes until the garlic is soft but not browned. Remove the garlic pieces with a slotted spoon.
Add one stick of whole butter to the pan. Whisk the butter into the oil as it melts.
Whisk 1 teaspoon of cornstarch into the butter mixture to thicken the sauce.
Place the cooked spaghetti in a large serving bowl and pour the sauce over the pasta. Toss the cooked spaghetti with the sauce and serve.