Don't add all of them to the batter. Reserve some to add to the top of the muffins right before baking. Adding lemon juice ...

These healthy blueberry muffins are made with wholemeal flour for extra fibre, great for a feel-good breakfast, brunch or afternoon tea. Each muffin provides 200 kcal, 5g protein, 24g ...

In a small bowl, toss the blueberries with the reserved flour mixture (this will help prevent them from sinking to the bottom of the muffins), then add to the bowl of batter and gently fold in.