Place a large, deep skillet or braiser over medium heat with 1/2 cup water and the baby spinach; cover and steam until wilted, about 1–2 minutes.
Remove the spinach, let cool slightly, then squeeze out excess moisture and roughly chop; set aside.
Discard the remaining water, wipe the pot dry, then return it to medium heat and add the olive oil.
Add the diced shallot and sauté until soft and translucent, about 5 minutes.
Stir in the minced garlic, nutritional yeast, onion powder, garlic powder, lemon zest, and ground chilies; cook for 1 minute until fragrant.
Add the light miso, Dijon mustard, dry orzo, cooked chickpeas, and chopped artichoke hearts; season with salt and pepper and stir to combine.
Pour in the vegetable stock, bring to a boil, then reduce heat to a simmer. Cook, stirring often and scraping the bottom, until the orzo is tender and most liquid is absorbed, about 8 minutes.
Stir in the non-dairy milk, lemon juice, vegan Worcestershire sauce, and the chopped spinach; combine and taste, adjusting seasoning as needed.
Serve hot, adding extra chili flakes if desired.