Small Batch Blueberry Muffin Recipe

Ingredients

• 1 large egg, at room temperature
• ¼ teaspoon pure vanilla extract
• ½ cup granulated sugar
• ¼ cup whole milk, at room temperature
• canola or vegetable oil cooking spray
• 4 Tablespoons unsalted butter, at room temperature
• 4 teaspoons granulated white sugar
• 1 ¼ cups all-purpose flour
• ¼ teaspoon kosher salt
• 1 teaspoon baking powder
• 1 ¼ cups fresh blueberries, at room temperature