Line a 12x8 or 13x9-inch dish with parchment paper with two sides
overhanging, or butter the pan generously.
In a 2 quart microwave-safe mixing bowl, combine the butter and
peanut butter. Microwave at full power for 2 to 2 1/2 minutes, or
until melted. Blend together. Mix in crumbs, peanuts and sugar
until the mixture is stiff. Press firmly into the prepared pan.
In a small bowl, combine chips, and shortening. Microwave at full
power at 30 second intervals, until the chips and shortening are
melted and can be stirred smooth. Pour over the peanut layer and
smooth the chocolate evenly with an off-set spatula. Refrigerate
until set, about 40 minutes.
Lift the candy from the pan by the two overhanging parchment
edges. Sprinkle the chocolate with two or three pinches of Maldon
flake salt, if using. Cut the bars into pieces and store in a container
that seals air-tight.
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