Partially unwrap the bunny. Use a knife to mark the spot where you'll insert the straw.
Heat a paring knife over a gas stove or in a mug of hot water. Wipe it dry on paper towel, then insert it into the bunny and twist the knife until the opening is big enough for a small funnel and a straw.
In a cocktail shaker filled with ice, combine vanilla vodka, white chocolate liqueur and half-and-half. Shake vigorously.
Place a funnel in the opening of the chocolate bunny, then decant the cocktail into the bunny.
Notes
Important! The chocolate bunny should be hollow. I've found the Lindt brand to work well. Beverage ideas: For beverages, you can add chocolate milk for the kids or fill them with a cocktail like the white chocolate martini above. Stay away from anything warm like coffee or hot chocolate!