Place a large deep skillet or braiser over medium heat and add 1/2 cup water and the baby spinach. Cover and steam until wilted, about 1–2 minutes.
Remove the spinach, let it cool slightly, then squeeze out excess moisture and roughly chop; set aside.
Pour the remaining water out and wipe the pan clean. Return the pan to medium heat and add the olive oil.
Add the finely diced shallot and sauté until soft and translucent, about 5 minutes.
Add the minced garlic, nutritional yeast, onion powder, garlic powder, lemon zest, and ground chilies (if using) and sauté for 1 minute.
Stir in the light miso, Dijon mustard, dry orzo, cooked chickpeas, and chopped artichoke hearts; season with salt and pepper.
Pour in the vegetable stock, bring to a boil, then reduce heat to a simmer. Cook, stirring frequently 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. Cook briefly until heated through and combined, then taste and adjust seasoning.
Serve hot, adding extra chili flakes if desired.