Well if you looking for easy I would recommend mealworms. They are the easiest BUT you have find the freshly molted ones for the young beardies due to risk of impaction. Mealworms aren't very nutrient enriched either, but they are easy to breed and keep. start with 200 to 500 mealworms. thats all it will take and put about 2-3 inches or more of bran, or oatmeal in the bottom of a large tupperwaare container, or if you perfur you can buy a 5, 10, or 2.5 gallon tank from the pet store and use it. I doesn't need to be tall, mealworms can't jump like crickets.
Put the mealworms in and add a peice of potato or some fruit of veggies once a week if you want to try to gut load them a little, but they are fine with their oatmeal if you don't want to but they will need some water. And thats it you'll soon see beetles and then the beetles will mate and lay eggs. the only other thing to do is to try and gather up the dead beetles just for hygenie (they die shortly after mating). Some people seperate the pupae (alien look ones) from the rest because mealworms can become cannablisitic, but if they have food and water you don't need to.
If you where able to breed crickets then I take my hat off to you, for me they have proven to be the most high maintance breeder I have tried yet, but if you can they are well worth your time.Crickets are generally straight forward start out with say 250 adults and they will start lying eggs, the hard part about crickets is seperating them by size, and having to clean up the dead ones/mess daily and making sure they have food and water which they seem to use more of the then the various worms (higher metabolism?). The thing with small crickets is the young beardies can inhale the 20 or so smalls you took a half hour to carefully seperate in under 5 minutes.
You might want to try superworms as well. If you are getting a baby they will not be able to start eating them right away, after they are about 9 months old they can eat them, but by then you would have a strong breeding program setup. Supers are breed like mealworms except if you seperate them they tend to pupate faster. Supers and their breeding are rather hot recently, if you want more info on any breeders just tell me and if I cannot answer it, maybe I can find someone who can