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

6/63 10 A Central: These have dropped to just $7.49 (one time purchase price). That’s about 62 cents each and a bargain. 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 Split Madagascar Vanilla Beans Grade B for Vanilla Extract Vanilla Powder Making 4”-6”(Pack of 1) – note that multiple variations of this product may be available, as such a different version may appear at this link