Preheat oven to 375℉. Place paper liners into your muffin pan (or grease with cooking spray) and set aside.
In a large bowl, combine the dry ingredients together–flour, baking soda, salt and sugar (if using). Whisk together to distribute ingredients evenly.
Measure your buttermilk in a liquid measuring cup.
Make a well in the center of the large bowl that contains the dry ingredients. Slowly pour in the buttermilk.
Stir the buttermilk into the dry ingredients using a circular motion. If dough seems too dry, add in about 1 tablespoon of extra buttermilk at a time.
Add in dried cranberries and fold into the batter. Do not over mix the batter.
Use a large portion scoop (or ice cream scoop) to scoop the batter into the muffin pan, filling about ¾ full.
If desired, sprinkle tops of muffins with a little bit of granulated sugar for added sweetness and a slightly crunchier muffin top.
Bake at 375℉ for about 18-22 minutes or until a toothpick inserted in the center comes out clean.
Cool on a wire for about 5 minutes in the pan. Remove muffins from the pan and continue cooling or enjoy warm. Make about 18 standard muffins.