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Export 5 ingredients for grocery delivery
Step 1
Add butter to a 6 or 8-oz mug. Microwave until melted.
Step 2
Stir in sugars, salt, egg yolk, and vanilla. Then stir in flour, followed by the chocolate chips.
Step 3
Microwave for 1 minute at 80% power until top springs back. Color will be light.
Step 4
Serve with ice cream or whipped cream, if desired, and enjoy!