My 21 month old DD goes to family day care so I have to provide everything. She usually has 2 serves of fruit (either an apple or banana, plus some grapes, or strawberries, or a small tub of fruit salad). A jam or vegemite/vegemite & cheese sandwich. Some sweet or savoury biscuits, and sometimes a small bowl of left over dinner if we've had pasta or casserole.

If I've baked, then she'll have a savoury muffin and/or some banana bread. Sounds like a lot, but she eats it everything, although sometimes leaves the biscuits, but I don't mind if they are left.