Add all the dry ingredients into a large bowl and stir to combine. Grate the frozen butter into the dry ingredients.
Add the blue cheese, spinach, parsley, and green onions. Make a well and add the eggs and half the buttermilk. Fold until just holding together , adding more buttermilk as needed. Line a sheet pan with parchment paper. Scoop 3-ounce portions of batter onto the paper.