1️⃣ Preheat oven to 375°F (190°C) and line a muffin tin with paper liners.
2️⃣ Mix dry ingredients: In a bowl, whisk flour, sugar, baking powder, baking soda, and salt.
3️⃣ Prepare wet ingredients: In another bowl, mix melted butter, milk, vanilla, and egg. Combine with dry ingredients.
4️⃣ Add blueberries and gently fold them into the batter.
5️⃣ Make cream cheese filling: Mix cream cheese with powdered sugar until smooth.
6️⃣ Assemble muffins: Fill each muffin cup halfway with batter, add a teaspoon of cream cheese mixture, and top with more batter.
7️⃣ Bake for 20-25 minutes until golden brown. Let cool & enjoy!