Maybe you haven't realized it until now, but having powdered milk at home is never a bad thing.
Besides situations when you run out of or your regular milk spoils and you need it immediately, powdered milk is also useful for baking or cooking. You can use only as much as you need, and there's no risk of it souring. It also has a shelf life of up to 8 months.
Here are some tips on how to use it.
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If you bake cakes at home, you surely know the recipe for making fake marzipan. The basic ingredient is powdered milk, and although preparation requires practice, this "marzipan" can be used not only to cover cakes or pastries but also to create various figures, numbers, or flowers. And it tastes great.
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Do you drink coffee with milk? Usually, you buy various condensed milk packages for this purpose. Such milk is most often treated with UHT heating and thus completely dead. How about preparing condensed milk from powdered milk yourself?

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Similarly, you can prepare a great treat for both kids and adults. Can't resist sweetened condensed milk in a tube? If you have powdered milk at home, you can make such a delicacy yourself. This way, you can better monitor sugar consumption and try other flavors. You surely know those granulated mixes for flavored milk preparation, like banana, vanilla, or strawberry. Those are ideal. Or use cocoa, chocolate, or other flavors you discover.
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Cooking milk sauces or stews. Instead of using the traditional roux and milk, you can thicken the stew directly with powdered milk. Just dilute the appropriate amount with less water than needed for drinking milk preparation, and that's it. People suffering from celiac disease will especially appreciate this.
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And finally, we cannot forget probably the most widespread use of powdered milk. If you are going on a trip, don't forget to pack it, especially in summer. For children, whole milk is suitable, and for older ones, semi-skimmed suffices.
Cheers.