Preheat oven to 400 degrees and line your muffins tins with muffin liners.
In a large bowl, whisk eggs until lightly beaten.
Next, add in granulated sugar, and whisk until combined.
Add in canola oil and vanilla extract; whisk until combined.
Add in dry ingredients: flour, salt, baking soda, and baking powder. Mix until lightly combined (the batter will be stiff and all of the dry ingredients will not be incorporated—that’s okay!).
Add in sour cream and milk, and mix the batter until just combined.
Lastly, add in the blueberries. Sprinkle the 1 Tbsp of flour over the blueberries. Then, mix until the blueberries are evenly dispersed in the batter.
Divide the batter into the muffin cups, filling about 2/3 of the way full (this recipe makes about 14 muffins).
Spoon a little of the blueberry sauce over each muffin (a spoonful is just fine on each muffin cup). Using a knife, cake tester, or toothpick, swirl the sauce into the batter.
Bake for 18-20 minutes, or until the tops are lightly golden brown and a cake tester comes out clean.
Allow to cool for a few minutes. Best when served warm. If you have any extra blueberry sauce, spoon it on top of the muffins when serving, if desired.