Mix the flour, sugar, baking powder and salt together in a mixing bowl.
Add the additional 1 tbsp. flour to the blueberries and toss gently.
In another small mixing bowl, beat the egg slightly then stir in the milk and oil.
Add the egg mixture to the flour mixture and stir until just combined being careful not to overwork the dough.
Add the blueberries to the muffin mixture. Stir gently until everything is combined
Spoon into muffin tins and bake for 20 – 25 minutes in a preheated 400 degree oven.
Notes
Spray the muffin paper liners with non-stick baking spray. This will ensure that the muffins don't stick at all to the paper liners when they're done baking.