Real toffee means a candy thermometer and a real chance of burning your kitchen, but browned butter gets you most of that same deep, nutty caramel flavor with none of the danger. These came out of wanting a protein bar that didn't taste like vanilla cardboard, and browning the butter first turned out to be the fix.
Whisking the protein powder in gradually is the one step worth being patient with, dump it in too fast while the mixture is hot and it clumps instead of blending smooth. They firm up in the fridge in about an hour and slice clean.
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