Preheat your oven to 400°F (200°C).
Cut the acorn squashes in half lengthwise and scoop out the seeds.
Drizzle the insides with olive oil, and season with salt and pepper.
Place the squash halves cut-side down on a baking sheet and roast for 25-30 minutes.
Meanwhile, prepare the quinoa. In a pot, combine quinoa and vegetable broth, and bring to a boil.
Once boiling, reduce to a simmer, cover, and cook for 15 minutes or until liquid is absorbed.
In a skillet, heat a drizzle of olive oil over medium heat. Add onions and garlic; sauté until softened.
Add the chopped spinach and thyme to the skillet. Cook until wilted.
Combine the cooked quinoa, sautéed vegetables, pecans, and feta cheese in a large bowl. Mix thoroughly.
Stuff the acorn squash halves with the quinoa mixture.
Return the stuffed squashes to the oven and bake for an additional 15-20 minutes.
Remove from the oven and let cool slightly before serving.