Prepare the frying oil by adding some neutral tasting vegetable oil (or shortening) to a 2 or 3 quart saucepan 2" deep. Amount will vary depending on the pot you choose. Heat on medium high until it reaches 350 - 365 F.
4 cups vegetable oil
Combine the sugar, melted butter, eggs, and vanilla in a medium sized bowl. Whisk or use a hand mixer to mix until all ingredients become a light yellow shade, about 2 - 3 minutes
½ cup sugar, 2 tablespoon butter, 3 eggs, 1½ teaspoon vanilla extract
Whisk the dry ingredients together so that they are evenly combined, add half the flour mixture to the wet ingredients. Use a spatula and mix the dry and wet ingredients, scraping the bowl sides down.
3 cup Flour, 1 tablespoon baking powder, 1 teaspoon baking soda, ½ teaspoon salt, ½ cup buttermilk
Add the buttermilk and the remaining flour mixture to make a ragged dough ball.
Place the ball of dough on a rolling mat or large piece of parchment paper that has been lightly floured. Roll dough into a disc ¾" thick. Cut out 2" circles with a round cookie cutter.
Use a skewer or chop stick to make a small ¼" to ½" round opening in the middle of each mini donut circle. Don't worry if the hole is not perfect, the dough rises during frying and it won't be perfect even if you used a circle cutter.
Check the oil temperature, when it is between 350 F and 365 F, drop one or two into the hot oil, and slowly add one or two more. Flip the donuts once the rise and float on top and are a golden brown. Calculate 2-3 minutes per side.
When your donuts turn that lovely golden brown on both sides, lift them up with slotted spoon or wire lifter. Place on some paper towels to let excess oil be absorbed while the donuts cool.
Roll in powdered sugar when the mini donuts are just slightly warm to touch. After the first roll, roll each of them a second time in powdered sugar. The second powdered sugar roll is the one that will have them looking just like copycat Little Debbie Mini Donuts!
1 cup powdered sugar