Trim leek and wash, using only white part.
Peel and dice celery and carrots.
Cut cauliflower into bite sized florets.
Melt butter and oil in dutch oven or pot of your choice.
Add vegetables (except peas) to pan. Cook about five minutes. Add sprigs of thyme (to be removed later).
Add fresh herbs of choice. Add bay leaf.
Season with salt, pepper, umami seasoning (if you have it).
Stir in chicken broth.
Once chicken broth is warmed through about twenty minutes, add in optional heavy cream. It's okay to skip.
Add in chicken, frozen peas.
Season as needed with salt and pepper. Serve once peas are cooked through.