Bring 2 1/2 cups of water to a boil in a medium pot. Stir in salt, pepper, and granulated onion powder. Slowly whisk the polenta into the boiling water to prevent clumping.
Reduce the heat to low, cover the pot, and let it cook for about 10 minutes. Stir thoroughly, then cover and cook for another 10 minutes, stirring occasionally until the polenta is thick and creamy.
While the polenta cooks, prepare the gremolata and set it aside.
For the vegetables, heat 1 tablespoon of olive oil in a large skillet over medium heat. Add the mushrooms first, sautéing for 4–5 minutes until tender.
Add the chopped shallot, asparagus, fiddlehead ferns, and a pinch of salt and pepper. Stir frequently and cook for about 5 minutes until the vegetables are just fork-tender. Lower the heat as needed to retain vibrant colors.
Add a splash of sherry wine or water, then cook for another minute or two to reduce the liquid. Adjust the seasoning and sprinkle in fresh thyme.
Assemble the bowls: Divide the polenta between 2 bowls. Top with sautéed veggies, pea shoots (if using), and a generous drizzle of gremolata. Serve warm!