Step 1

In a medium sized pan, sauté onion and garlic with olive oil for 3-4 minutes, until lightly browned.

Step 2

Add zucchini and mushrooms and cook for an additional 3-4 minutes, until veggies are tender.

Step 3

In a large bowl, combine sautéed veggies and all remaining ingredients.

Step 4

Let sit for 10 minutes so oats can absorb the liquid.

Step 5

Add to a 9 x 12 baking dish and bake uncovered at 375 degrees for 22-25 minutes, until top is lightly browned and middle is cooked through.

Step 6

Serve with extra marinara on the side!