Nonstick cooking spray
2 cups all-purpose flour
1/4 cup sugar
1/4 cup light brown sugar
1/4 teaspoon salt
1 Tablespoon baking powder
1 large egg
1 cup buttermilk
2 Tablespoons unsalted butter melted and cooled
2 Tablespoons canola oil
1 cup frozen blueberries
(1 teaspoon lemon zest and 1 teaspoon vanilla extract) or (1/2 tsp. vanilla extract and 1/2 tsp fiori di sicilia)
Preheat the oven to 350 degrees F. Spray a 12 cup muffin tin with nonstick spray.
Combine the flour, sugars, salt, and baking powder in a large bowl. Whisk the egg in a medium bowl until smooth, then add the buttermilk, melted butter, oil and vanilla (or vanilla and fiori di sicilia combination). Add lemon zest if using.
Add the wet ingredients to the dry ingredients and mix until the batter just comes together. Fold in the frozen blueberries. Evenly divide the batter among the prepared muffin cups, filling each three-quarters full.
Bake until a toothpick inserted into the center of a muffin comes out with a few moist crumbs attache 18 to 20 minutes. Let cool in the pan on a rack for 10 minutes. Remove from the tin and let cool 5 minutes longer.