Preheat the oven to 350 degrees F and prep your silicone baking mold by spraying with baking spray evenly or prepare a muffin pan with liners.
In a medium bowl add flour, salt, and baking powder whisking to combine.
2 ½ Cups All-Purpose Flour, ¼ teaspoon Salt, 1 Tablespoon Baking powder
In a separate large bowl, add water, oil, eggs and extract into a bowl and whisk until smooth.
⅔ Cup Water, ¾ Cup Canola oil, 3 Eggs, 2 teaspoons Vanilla or Lemon Extract
Place lemon zest and sugar together in a food processor and pulse for a few minutes. Then add sugar mixture into the bowl of wets and mix to combine.
Zest of 4 Lemons, ⅔ Cup Sugar
Add dry ingredients to the wet ingredients in two separate parts, mixing until just combined. Then add blueberries, folding them into the batter gently.
1 ⅓ Cups Blueberries
Add batter into each mold or muffin liner until they are ¾ of the way full and add a sprinkle of salted crumble on top.
Then bake muffins until a toothpick can be inserted into the middle of the muffin and it comes out clean. For the silicone mold muffins, this should take approximately 18-20 minutes. Let the muffins cool for ten minutes in the molds before turning upside down and removing the muffins from the mold. If your mold was greased well, the muffins should slide out easily.
If using a muffin tin, they can take between 22 and 26 minutes to bake.
You are of course welcome to choose whether you want to cut off the domed portion of your muffins into a perfect cylinder or simply let them be!
Allow muffins to cool completely before frosting.