Can you tell me how to make Blueberry Mug Muffin?
Here's a recipe for Blueberry Mug Muffin:

Ingredients:

• 1/3 cup all-purpose flour
• 2 tablespoons sugar
• 1/4 teaspoon baking powder
• 1/4 teaspoon kosher salt
• 1/4 cup milk
• 2 tablespoons unsalted butter, melted and cooled
• 1/2 teaspoon vanilla extract
• 1 tablespoon lemon zest
• 1/4 cup fresh blueberry
• sparkling sugar, optional

Instructions:

1. In a mug, whisk together flour, sugar, baking powder, and kosher salt.
2. Add milk, butter, and vanilla. Mix until smooth.
3. Stir in lemon zest and blueberries.
4. Microwave for 11/2-2 minutes, or until cake appears puffy and cooked through.
5. Cool 2 minutes. Top with sparkling sugar (optional).

Enjoy your Blueberry Mug Muffin!