You can add this right to your homebrew or soak them in alcohol to make an extract and add that to your homebrew.

9/9 4:30 PM Central: These are on sale for just $8.95 (one time purchase price). Shipping is also free to many US addresses with Prime Membership [Try Prime for Free] or a qualifying order.  Prices, promotions and availability can change quickly.  Check product page for current info – More About Prices

12 Large Tahitian Vanilla Beans – Vacuum Sealed Grade A Vanilla Pods – Rich, Creamy Flavor & Aroma – Ingredients for Baking, Homemade Extract, Paste, Brewing, Coffee, Cooking – , 12-Pack – note that multiple variations of this product may be available, as such a different version may appear at this link