[‘Use softened butter for best crust texture.’, ‘Fresh lemon juice is preferred over bottled for brightness.’, ‘Do not overmix the filling after adding flour to avoid toughness.’, ‘Gently fold in blueberries to keep them intact.’, ‘Watch oven temperature and start checking bars a few minutes early to avoid overbaking.’, ‘Cool completely and refrigerate to ensure bars set properly for clean slicing.’, ‘Frozen blueberries can be used if thawed and drained well.’, ‘For gluten-free, substitute all-purpose flour with almond or gluten-free baking flour.’, ‘For dairy-free/vegan, use coconut oil instead of butter and a flax egg instead of a regular egg.’]