Melt butter in pan over medium-low heat
Whisk minced garlic into melted butter and let cook for 30-60 seconds
Sprinkle flour into pan and whisk for about a minute while it cooks
Gradually add liquids, including brandy, constantly whisking
Cook and whisk until sauce thickens
Once thickened, remove from heat and add other ingredients (cheese, nutmeg, other spices like savory, fennel, rosemary, thyme, depending on your needs)