Can I make this in one large batch with the streusel on the side? I want to drop it off for a friend

Cindy -
I agree with Emma about packing the streusel separately for garnish just before serving.
Another idea for serving many people or sticking the fridge - multiply the recipe and bake in a cupcake tin in a water bath. That way cooking time will be similar to original (individual servings).
See recipe here for creme caramel in muffin tin...similar idea.

Yes, that should work! That's so thoughtful :) Just a heads up that it might take longer to chill/set.