Warm the broth: Add broth to a small pot and keep it at a bare simmer on low. Warm broth helps the orzo cook evenly and stay creamy.
Prep the produce: Clean mushrooms with a damp towel and slice. Finely chop the onion (or shallots) and mince the garlic.
Strip thyme leaves from stems.
Sauté the mushrooms: Heat 1 tablespoon olive oil and 1 tablespoon butter in a wide, heavy skillet over medium-high. Add mushrooms in a single layer. Let them brown undisturbed for 3–4 minutes, then stir and cook until golden and their liquid evaporates.
Season with salt and pepper. Transfer to a bowl.
Build the flavor base: Reduce heat to medium. Add another tablespoon olive oil and the chopped onion.
Cook, stirring, until soft and translucent, about 4–5 minutes. Add garlic and thyme; cook 30 seconds until fragrant.
Toast the orzo: Add the gluten-free orzo to the pan. Stir to coat in oil and aromatics, letting it toast lightly for 1–2 minutes.
This helps develop a nutty flavor and prevents mushiness.
Deglaze with wine: Pour in the white wine and stir, scraping up any browned bits. Cook until the wine is mostly absorbed, 1–2 minutes. If skipping wine, add a ladle of broth instead with a squeeze of lemon juice later.
Add broth gradually: Add 1 cup of warm broth and stir gently.
When most of it is absorbed, add another 1/2–1 cup. Continue adding broth in increments, stirring every minute or so, until the orzo is just tender with a silky sauce. This usually takes 10–12 minutes, but check your package directions.
Return mushrooms and finish: Stir the mushrooms back in.
Add 1–2 tablespoons butter and the Parmesan. Mix until glossy and creamy. If it seems too thick, add a splash of broth to loosen.
Brighten and season: Add a little lemon zest and a squeeze of juice to wake up the flavors.
Season with salt and black pepper to taste. Fold in chopped parsley.
Serve immediately: Risotto waits for no one. Spoon into warm bowls and top with extra Parmesan, a drizzle of olive oil, and more pepper.
For a little indulgence, finish with a few drops of truffle oil.