Step 1

Preheat your oven to 350°F. Fill a medium sized pot with water and fit with a steamer attachment. Bring the water to a boil and steam the broccoli florets until crisp-tender (about 3-4 minutes). Remove them from heat.

Step 2

Blend all of the sauce ingredients together in a high speed blender or a food processor until they're totally smooth.

Step 3

Heat the olive oil in a large skillet over medium heat. Add the onions and celery, and sauté the vegetables until the onion is clear and soft (about 7 minutes). Add the quinoa and the broccoli to the skillet. Add the sauce and stir everything to heat it through.

Step 4

Transfer all ingredients to an oiled 7x11 or 8x12 baking dish. Top with breadcrumbs, if using. Bake for 30-35 minutes, or until the casserole is bubbling gently and the breadcrumbs are golden. Allow to cool for 15-20 minutes before cutting into squares and serving.