Heat the oven to 350* and slice the acorn squash down the middle.
Remove the seeds with a spoon, then place the squash on a sheet pan.
Drizzle with olive oil, salt, and pepper and place the pan in the oven.
Bake 1 hour, or until the scorn squash has begun to brown on top and is cooked all the way through (with the tip of a knife going smoothly all the way through the squash)
Set aside until serving.
While the squash is cooking, make the quinoa: Heat the olive oil over medium heat until shimmering, then ad the onion and mushroom.
Cook until the onion has begun to soften, about 3-5 minutes.
Add the garlic, quinoa, and broth and stir to combine.
Bring to a boil, then lower to a simmer.
Cook, uncovered, for 30-40 minutes, stirring occasionally, until all the liquid is absorbed.
Once the liquid is cooked off, stir in the parmesan.
Spoon the cooked risotto into the acorn squash and serve warm.