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Preheat the oven to 325 degrees F. Line a 9x13 baking sheet with parchment paper and set off to the side.
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Add egg white to the bowl of an electric stand mixer fitted with the whisk attachment. Whip egg for one minute until frothy. You can also just use a hand mixer.
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Add the sugar and whip together until combined and smooth.
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Add oil, milk, and vanilla to the bowl. Whip until smooth.
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Combine the flour, cocoa powder, salt, baking soda in a small mixing bowl. Add the dry ingredients to the bowl and beat on low until smooth and combined.
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Spread the batter in a very thin layer over the parchment. Top with chips and caramel bits. Bake for 15 minutes.
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Remove from oven. Score crisps into 16 square pieces. Bake for another 10 minutes. Cool completely on baking sheet.
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Once cooled, break along score mars and store in a semi-air-tight container. Leave the lid to a tupperware container slightly open and store on the counter.