Before you start, preheat the oven to 375 degrees. Pour the flour, baking powder and salt into a bowl and stir to combine.
In another bowl, beat the egg and add the sugar, brown sugar and milk. Mix. Stir in the cooled melted butter.
Add the wet ingredients to the dry ingredients and mix just enough to combine. Fold in 1 cup of blueberries.
Fill your muffin tin with cupcake liners and fill each ¾ full with the batter.
Bake at 375 degrees for 20 minutes.
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Notes
Fresh or frozen blueberries work great—no need to thaw frozen ones.
Let muffins cool completely, then freeze in a zip-top bag for up to 3 months.
Lightly coat blueberries in flour before adding to batter to keep them from sinking.
Nutrition information is an estimate only and will vary based on exact ingredients and brands used. This data should not be considered a substitute for professional dietary advice. Please consult a registered dietitian or nutritionist for specific dietary guidance.