Preheat oven to 375 and lightly spray muffin pan.
Sift flour, salt, baking powder and soda together in large bowl.
In small bowl blend egg, sugar, 3/4 cup yogurt and applesauce.
Gently fold wet ingredients into dry and mix only til moist. Fold in blueberries.
Fill muffin pans 1/3 full and then add 1 tsp or so of the remaining yogurt. Top with more muffin mixture to 2/3 full.
Bake for about 20 minutes or until done.
Makes about 20 regular size muffins.
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