You start with spreading out the frozen vegetables on cookie sheets. You may want to put a bath towel underneath the cookie sheets to let the condensation be absorbed rather than run all over the countertop. I let them get to room temperature so the moisture would not drip inside my dehydrator.
When thawed, spread the mixed vegetables evenly over your dehydrator racks.
I set my Excalibur Dehydrator at 125 degrees F. (51 C.). These took about 10 hours, this time will all depend on the humidity in the room you are dehydrating yours. Please check your dehydrator booklet for the correct temperature.
How To Condition Your Fruit or Vegetables
If you live where it is HUMID: “To condition the fruit, take the dried fruit that has cooled and pack it loosely in plastic or glass jars. Seal the containers and let them stand for 7 to 10 days.
The excess moisture in some pieces will be absorbed by the drier pieces. Shake the jars daily to separate the pieces and check the moisture condensation.” https://nchfp.uga.edu/how/dry/pack_store.html
I live in the DRY DESERT: I set my fruit and vegetables on my countertop for 5-7 days. Ten days is even better to make sure everything is dry before using your FoodSaver unit.
Now, use a high-powered blender to pulverize the dehydrated vegetables to make a vegetable powder, if desired. It's more concentrated so you will use less when cooking it with it. Use airtight jars to store the vegetable powder.