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Export 4 ingredients for grocery delivery
Step 1
In a microwave-safe mug, melt the butter. It takes about 30 seconds.
Step 2
To the melted butter, stir in the white and brown sugars. Add the egg yolk and vanilla. Stir to combine. Mix in the flour, salt, and chocolate chips.
Step 3
Microwave for 40 seconds to 1 minute until just set.
Step 4
Allow to cool for a couple of minutes and enjoy!