I have found that the best way to make french fries is to boil them first, as this keeps the insides from drying out.
First get a large pot of water to the boiling point. I use my Vidalia Onion Choppper (larger grate) to cut the potatoes into fries. Put them into the boiling water until they get just get a little soft to the bite, barely. You don't want to boil too long, or they turn into a mushy mess (Believe me, I learned the hard way!) Then drain with a colander, and rinse well with cold water. Then add aquafaba (chickpea liquid) to the potatoes, in a bowl, along with salt and pepper, flax meal, chipotle, paprika, garlic, turmeric or whatever flavor you desire. Use parchment paper so they don't stick, and spread them out to a single layer, leaving lots of air space around each one. Don't crowd them at all.
Bake at 425 for 15-20minutes. To brown them up a bit, you can change to broil the last few minutes, but STAY RIGHT THERE to watch them. For smaller portions, a toaster oven is great. Now get out the ketchup and mustard, and get ready to feast on fries! Plant Based foods are the best!
Tip: For use later in the week, I boil them, drain and rinse, then spice them up and cool. I keep them in the fridge for use later in the week. When I reheat, it is either microwave, toaster oven, or fry pan over heat.