Make the cashew cream: in a blender combine drained cashews, 1/3 cup water, and nutritional yeast; blend on high until very smooth and set aside.
Heat a large braiser or Dutch oven over medium and add 1 teaspoon olive oil.
Add the broccoli in a single layer, press down, and let cook undisturbed 4 minutes until the undersides brown and the broccoli brightens; season with salt and pepper, toss lightly, then transfer to a bowl.
Wipe out the pot, return to medium heat, and add the remaining 1 tablespoon olive oil. Add the diced shallot and cook until softened and translucent, about 4 minutes.
Add the minced garlic, minced thyme leaves, lemon zest, and chili flakes (if using); cook briefly until fragrant, about 30 seconds to 1 minute.
Stir in the orzo to coat it in the shallot mixture, then add the cooked chickpeas and season generously with salt and pepper.
Pour in 2 cups vegetable stock, bring to a boil, then reduce to a simmer and cook, stirring and scraping the bottom often, until the orzo is tender and creamy, about 8 minutes; add more stock as needed to maintain a loose, saucy consistency.
Once the orzo is soft, stir in the cashew cream and lemon juice, then add the seared broccoli back to the pot and bring gently to a simmer; taste and adjust seasoning.
Stir in chopped parsley and serve immediately, optionally with vegan parmesan and extra chili flakes.