Whisk dry ingredients:

In a large mixing bowl, combine the flour, baking powder, salt, and sugar by whisking them together.

Add cream and milk:

Pour in the heavy whipping cream and milk, then stir using a wooden spoon or spatula until a sticky dough forms.

Scoop dough portions:

Using a cookie scoop, portion out 1 tablespoon of dough per piece. Either drop directly into hot oil or place on a parchment-lined baking sheet to chill until needed.

Heat oil to 350°F:

In a 3-quart saucepan, heat the oil to 350°F (175°C), checking with a thermometer. Have a paper towel-lined baking sheet ready nearby.

Fry donut holes:

Fry 3-4 donut holes at a time, ensuring the pan isn't overcrowded. Cook each for about 3-5 minutes, turning halfway, until deep golden brown.

Drain and coat:

Remove with a slotted spoon and transfer to the paper towel-lined sheet. Let cool briefly before coating with cinnamon sugar or glaze.