There are certain treats that rabbits love. There are other treats that would make them sick of fed to them. Here's a list of what rabbits can/can't eat:
Alfalfa Sprouts, Apples & Apple branches, Artichoke, Asparagus, Banana (no skin), Basil, Beet Greens, Blackberry Leaves, Black Oil Sunflower Seeds, Carrots and Carrot Tops, Cauliflower, Celery, Cheerios (not many), Clover, Coriander (Cilantro), Dandelion Greens and Flowers, Eggplant, Grass, Kale, Mint, Mustard Greens, Oatmeal (plain dry), Parsley, Peaches, Peppermint Leaves, Peppers- Sweet, Pineapple, Pinecones, Plums, Pumpkin, Pumpkin Leaves, Radishes & Leaves, Shredded Wheat (plain), Spinach, Strawberry Leaves and Strawberries, Summer Squash, Zucchini, Turnips, Turnip Greens
NEVER FEED ANY RABBIT UNDER 6 MONTHS ANY FRUITS/VEGGIES OR THEY COULD GET DIARRHEA! ONES IN BOLD ARE THE ONLY ONES IN THE ABOVE LIST THAT BABIES CAN HAVE
Alfalfa Hay, Apple seeds, Baby Carrots (treated with preservatives), Banana Peel, Broccoli, Cabbage, Candy, Carpet, Cherries and Cherry leaves, Citrus Peels, Corn, Dried Fruit, Lettuce, Nuts, Pear Seeds
NEVER FEED LETTUCE! IT CAN CAUSE STOMACH ACHES AND DIARRHEA!
My rabbits especially seem to love their oats, carrots, kale, peaches and strawberries, and celery.
Some breeders give their rabbits bread. We don't, because we hardly ever have it in the house (everyone in my family besides my dad is allergic to gluten and dairy), and I don't believe it is very good for the bunnies' digestive system.