Lightly grease a medium skillet and place over medium high heat. Add the quinoa and stir until warmed, then season to taste with salt and pepper and pour into a separate dish. Do the same to warm the lentils, then it's time to assemble the bowls. Fill 4 to 6 bowls with spinach as desired and top with the warm quinoa, lentils, and pumpkin wedges. Add the other toppings, tomato slices, mushrooms, avocado, and walnuts and top with desired amount of Thai peanut sauce. Enjoy!