Bakery-Style Blueberry Muffins

Name: Bakery-Style Blueberry Muffins
Prep time: 20 min
Cook time: 20 min
Total time: 40 min
Cuisine: American
Ingredients: 8 tbsp unsalted butter (½ cup, 113 grams); 2 large eggs (room temperature); 1 cup buttermilk (240g); 2 tsp vanilla extract; 2½ cups all-purpose flour (318g); 2½ tsp baking powder; ½ tsp baking soda; ½ tsp fine sea salt; ¼ tsp ground cinnamon; ⅔ cup light brown sugar (145g); ⅓ cup granulated sugar (66g); 1½ cup blueberries (fresh or frozen); ¼ cup light brown sugar (60g); 2 tbsp granulated sugar; ½ cup + 2 tbsp all-purpose flour (75g); ⅕ tsp ground cinnamon; pinch of salt; ¼ cup unsalted butter (56g)