Preheat the oven to 390 Fahrenheit (ca. 199 °C).
Add all ingredients (white rice flour, nut meal, corn starch, cane sugar, dairy-free butter, salt, and vanilla extract) to a food processor and pulse until you get a crumb-like texture.
Take a mixing bowl and add the dough from the food processor. Knead it with your hands for 2 minutes to form a ball. If the dough is too dry, add 1-3 teaspoons of water. One teaspoon at a time.
Take 1 Tablespoon of cookie dough and form a ball with your hands.
Line a baking tray with parchment paper. Place the cookie balls on it, leaving some space between them.
Bake them for 10-12 minutes. Check them after 8 minutes to prevent over-browning.
Leave them on the parchment paper to cool down. While still warm, dust them with powdered sugar.
If completely cooled, roll them in powdered sugar again for a luscious finish.
