Buddhas Feast Vegetable Stir Fry

Name: Buddha's Feast (Vegetable Stir-Fry)
Ingredients: 1/2 cup Homemade Vegetable Stock, or canned low-sodium vegetable broth; 3 tablespoons low-sodium soy sauce; 2 tablespoons cornstarch; 1 tablespoon mirin; 1 teaspoon Chinese chile paste; 8 ounces firm tofu, cut in 1/2-inch cubes; 4 baby heads bok choy, or 1/2 head regular bok choy; 12 ounces broccoli, florets; 4 carrots, peeled and thinly sliced on the diagonal; 8 ounces small shiitake or white mushrooms, stemmed and julienned; 1 eight-ounce can sliced water chestnuts, drained; 1 fourteen-ounce can baby corn, drained; 2 cloves garlic, minced; Cooked brown rice, for serving; Nonstick cooking spray