Preheat your oven to 400 degrees.
Spray a 9x9 baking pan using nonstick cooking spray and set aside.
In a large bowl, crack the egg and beat it with a fork.
1 egg
Add the sour cream and sugar, and whisk to combine.
1 cup sour cream, 1 tablespoons sugar
Next, grate the cold butter into the mixing bowl and stir just enough to mix.
¼ cup butter
Add the remaining dry ingredients and stir until just mixed. The dough should be very sticky.
2 cups all-purpose flour, 1 teaspoon baking powder, ½ teaspoon baking soda, ¾ teaspoon salt
Add a dash of flour to your counter and use a rubber scraper to scrape the dough onto the counter.
Sprinkle a bit of flour on top and knead a few times.
Shape the dough into a mound and pat the dough to about 1” thick.
Spray the biscuit cutter using a nonstick spray, or use the open end of a cup if you don’t have one.
Cut the dough to form 9 biscuits.
Place the biscuits in your greased baking dish, with the sides almost or barely touching. Pat the tops slightly to smooth out the top.
Bake for 15 minutes, and enjoy!