Step 1

Preheat the oven to 350-degrees and line the muffin pan muffin liners, or apply cooking spray.

Step 2

In a large mixing bowl, combine the flour, sugar, salt, baking powder, and cinnamon. Set aside.

Step 3

Melt the 1/3 cup of butter.

Step 4

In a small mixing bowl, whisk the egg lightly. Add milk, melted butter, and vanilla.

Step 5

Add the egg mixture into the bowl with the dry ingredients. Mix lightly and slowly fold in the brown sugar.

Step 6

Coat the blueberries in flour (or use the streusel mixture to coat) and fold into the batter.

Step 7

If you're using tall liners, fill the muffin almost to the top of the pan. If you're using standard-sized muffin liners, fill about 3/4 full with batter.

Step 8

Mix the flour, sugar, salt, brown sugar, cinnamon, and butter together in a bowl. Use a fork to mash the butter into the dry ingredients. Sprinkle about a tablespoon on top of the muffins before going into the oven.

Step 9

Bake 20-25 minutes. Use the toothpick method to determine if they're done.