Toward end of marinating time, preheat oven to 400° Fahrenheit. Scrub 3 large russet potatoes under running water, removing all surface impurities.
Peel russet potatoes if desired, then cut each potato into equally-sized matchsticks.
Place cut potatoes in large bowl. Drizzle 2 tablespoons avocado oil over cut potatoes, then toss potatoes until completely coated in oil.
Sprinkle 1 teaspoon salt, 1 teaspoon garlic powder, and 1 teaspoon paprika over potatoes, then toss potatoes until well seasoned. Increase amounts of salt, garlic powder, and/or paprika if desired.
Transfer seasoned potatoes to large baking sheet. Arrange fries on baking sheet in single, even layer, without overlapping if possible. Use 2 baking sheets if needed depending on number of fries.
Place baking sheet in preheated oven. Bake fries 15 minutes, then remove baking sheet from oven.
Carefully flip fries over, then return baking sheet to oven. Bake fries 10 to 15 minutes more or until as crispy as preferred.