I find this tip not only convenient, but it also reduces my food bill. I use skim powdered milk for all cooking and smoothies. You could also use full cream, but I find I can use the skim for everything like custards, white sauces, cakes and muffins.
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We are older and found we were wasting money on milk. I now buy powdered milk. The initial cost seem high but I have no waste
When making oatmeal, why not substitute the milk with powdered milk. My children have never found out my secret.