01 -
Pour olive oil into a skillet and warm it on medium heat.
02 -
Toss in the minced garlic. Let it cook for around 3 minutes while stirring, until the smell is strong.
03 -
Start whisking the flour (use about 2 tablespoons first), salt, pepper, and oregano into the skillet.
04 -
Pour all the milk or half-and-half in at once, then whisk quickly. Keep stirring until the sauce thickens and starts bubbling, usually 3 minutes.