Of course you can! The taste and texture might differ but your fries would still taste delicious and would also be healthier.  Here's a simple trick to bake crispy potato fries: Spray the potato sticks with light oil on both sides; it will not only give you a crispier exterior but also keep the insides soft and mealy. Bake your mashed potato french fries in the oven for 10-15 minutes at 425℉. Turn them over and repeat the process to get both sides crispier and golden brown!