preheat oven 450F, lightly coat cookie sheet with cooking spray

stir together well flour, onion powder, salt, baking powder and soda

blend and chop in cold butter into flour mixture until small crumbs form

add cheddar and green onions mixing well

stir in 1&1/2 cups sour cream, increasing slowly till dough forms

on lightly floured surface roll dough out to 1/2" thick, cut out 12 biscuits

place 1" apart on prepared cookie sheet, bake 10 -12 min or until golden brown