Blueberry Muffins - Spoonful of Scrumptious

Ingredients

• 2 cups all-purpose flour
• 2 tsp baking powder
• 1/2 tsp baking soda
• 1/2 tsp salt
• 1/2 cup unsalted butter, softened
• 1 cup granulated sugar
• 2 eggs, room temperature
• 1 tsp vanilla extract
• 1/2 cup buttermilk, room temperature
• 2 cups blueberries
• 1/4 cup all-purpose flour
• 1/4 cup brown sugar
• 4 tbsp unsalted butter, cold