I make my own rabbit treats. They are pretty easy to do.
You need some ground up pellets (or the dust from a bag), ground up oat meal, ground up barley and a fruit/veggie base of your choosing. I use apple sauce (nothing added), banana or pumpkin puree. You will use about equal parts of the dry ingredients and maybe a bit more of the pellets.
Mix them all up to they are mushy but not sticky and not crumbly. Roll or smush it out. You can use some pellets to help keep it from sticking to the rolling pin and board/counter. Cut into pieces and roll each one in the pellets to coat it. Bake for about 20 minutes a side at 350F. Let them cool before giving to your rabbits.