Preheat oven to 400 degrees.
Mix together flour, salt, sugar, baking soda, and baking powder in a large bowl.
In a separate medium-sized bowl, whisk eggs, milk, butter, and vanilla.
Combine dry and wet ingredients.
Fold in chocolate chips or blueberries.
Pour batter into nonstick muffin silicone or tin with liners.
Put muffins in oven and lower temperature to 350 degrees. Bake for 20-22 minutes or until internal temperature reaches 200 degrees.