It looks like either the Teapots or the Acoma Vases.
Teapot: 3 Power, 24 Blueberry + 16 Mud, gives 241 XP
Acoma Vase: 4 Power, 10 Mud + 1 Water, gives 238 XP
The few Kiln crafts that have higher XP require you to Ask or Post for ingredients. And they don't get you that much more XP.
thank you so very much..:)
What do you think?