For non-breeding birds, you can offer a small amount of eggfood once or twice a week as a supplement to the bird's regular diet. It is a good source of protein, which is especially helpful if your bird is molting or under stress. And soft food is a useful option when giving powdered or liquid medications to birds, so I think it is a great food to introduce to all birds.
Just avoid overfeeding, since it is quite rich.
Offering too much rich foods can encourage nesting and hormonal behavior (abundant resources trigger breeding in the wild) and contribute to weight gain.
Here are a couple of recipes:
Egg food is a excellent food source for any budgie! There are many recipes and ways of preparing it, and while there are many different commercially prepared brands of egg food we prefer to make our...
www.cutelittlebirdiesaviary.com
Recipes for Eggfood.
www.finchaviary.com
I use a commercial eggfood product, so I don't have experience mixing my own. However, I see no reason why you couldn't use bread crumbs. Like making chop, eggfood is very flexible. It is simply hardboiled egg and a binder, like biscuit, breadcrumbs or cooked grains. I would try a 1:1 ratio. If it is too wet, add more crumbs. If it is too dry, add a bit of water. You can add other ingredients, like seeds or chopped veggies too. You want the final mixture to have a crumbly damp consistency so it holds together, not too watery or sticky.