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Export 6 ingredients for grocery delivery
Step 1
In a mug, whisk together flour, sugar, baking powder, and kosher salt.
Step 2
Add milk, butter, and vanilla. Mix until smooth.
Step 3
Stir in lemon zest and blueberries.
Step 4
Microwave for 1½-2 minutes, or until cake appears puffy and cooked through.
Step 5
Cool 2 minutes. Top with sparkling sugar (optional).
Step 6
Enjoy!