Preheat oven to 375 degrees. Grease a 9 x 13 baking dish. Set aside
In a large pot over medium-high heat, heat the oil. Add the red bell pepper, shallots, and spinach. Saute for 4 to 5 minutes or until the bell pepper and shallots are softened. Add the garlic and sautee for 30 seconds or until fragrant.
Add the quinoa, vegetable broth, salt, and pepper to the pot. Stir to incorporate.
Bring the mixture to a boil. Cover and reduce heat to a simmer. Continue simmering for 15 to 20 minutes or until all of the liquid has been absorbed. Remove from heat and stir.
Add the milk and 1 1/2 cups of the cheese to the mixture. Stir to combine.
Pour the mixture into the prepared baking dish. Sprinkle the remaining 1/2 cup cheese over the top.
Bake in the oven for 30 minutes or until the top is golden.
Allow to cool for 10 minutes before serving.
Enjoy!