Step 1

Preheat the oven to 400 degrees F with rack in the center of the oven.

Step 2

Spray the inside of a 12 cup muffin tin with pan spray (You will only be using 10 of the 12). Then, using vegetable shortening, liberally grease the top of the pan. Place muffin papers into the sprayed holes. Set the pan aside.

Step 3

In the bowl of a stand mixer, cream butter and shortening for one minute with the paddle attachment.

Step 4

Add sugar and beat on medium for about one minute.

Step 5

With the machine on medium, add one egg at a time and blend to mix. Scrape sides then beat on medium for two and a half minutes. This is important to whip air into the batter.

Step 6

Add vanilla and beat for a few more seconds to combine.

Step 7

Remove ½ cup of blueberries to a small bowl and mash with a fork or a potato masher. Set aside.

Step 8

See how much liquid the blueberries gave up. I determined that it was a bit too much and pulled ¼ cup of liquid out which I did not use in the muffins. I did leave some juice in with the blueberries however, maybe about ¼ to 1/3 cup.

Step 9

Take two tablespoons of either flour type and sprinkle over the whole blueberries and toss to coat.

Step 10

Mix both flours, salt and baking powder in a small bowl. Just stir a few times to mix.

Step 11

Start adding the flour mixture and the milk a little at a time with the mixer running. Once they are both in, do not mix further. You want to just get them incorporated without over mixing. Otherwise the muffins will be tough.

Step 12

Remove the mixing bowl to your counter and fold in the mashed blueberries. Then fold in the whole berries with the juice.

Step 13

The traditional Jordan Marsh blueberry had a purple/blue tint from the berry juice.

Step 14

Using an ice-cream scoop, divide the mixture between ten cups of the prepared 12 cup muffin tin. The batter will be piled high above the rim.

Step 15

Sprinkle the final granulated sugar over the tops of each muffin (total 2 tablespoons) and immediately place in the oven.

Step 16

Bake for five minutes then reduce the oven temperature to 375 degrees F and bake for 20 more minutes. (If your oven has a hot spot, rotate pan halfway through. Do not over bake. They will be soft but 25 minutes is plenty of time and they will bake a little further outside of the oven.)

Step 17

Remove to a rack to cool.

Step 18

Once cool, gently pry the muffins out by making sure the overhang did not stick to the pan top.