Low GI 'Filler' Carbs on a Keto Diet

Currently planning a very low carb progressive calorie restrictive diet… I am looking to keep training and non training days constant in terms of calories… Initially this involved two seperate meal plans - one for training days where there was some workout nutrition and one for non training days where 200-300 calories suddenly opened up.

My idea then was to use the meal plan for the training days for both days… but on the non training days I would simply use some very simple “filler” nutrition to match everything up.

Most likely some milk protein powder for the protein source… but for the carb source I was a bit stuck… I need something fairly low GI that would be happy in a keto diet and requires minimal preparation.

My initial thought was dried goji berries with a GI of 29. Thoughts?

Cucumbers and celery.

Along with what the other poster stated I also use Asparagus, Romaine Lettuce, Spinach, Broccoli, and Cabbage.

SHIRATAKI NOODLES!!! made with kanjac flour…all fibre no sugar or starch
Net Carbs: 0!!