Preheat the oven to 425 degrees.
On a lined baking sheet, place the chicken breasts, season with salt and pepper with a drizzel of olive oil. Bake for 30 minutes.
Allow the chicken to rest while the soup is being prepared.
Chop vegetables and set them aside individual containers. This will help you easily and quickly assemble the soup.
Heat the olive oil in a heavy-bottomed pot over medium heat. Add the onions, season with salt and pepper, and saute until translucent. About 5 minutes.
Next add in the carrots, season with salt and pepper, and cook for about 3 minutes. Add in the remaining vegetables in this order repeating the process: Zucchini, Mushrooms, and Peas.
Add the pesto and chicken stock. Stir well to combine and distribute the pesto evenly. Bring the soup to a simmer, which will take about 10 minutes.
Chop the chicken into 1/2 to 3/4 inch pieces and add it to the soup.
Once the soup is simmering, add the orzo pasta and cook until before al dente when the pasta still has a good bite. This will take about 5 minutes.
After 5 minutes have passed, turn the soup to low or off and let the orzo continue to cook through slowly. This will another 10 minutes, approximately.
While the soup is resting, make the crunchy oven-baked toasts. Start by pre-heating the oven to 425 degrees.
Slice two pieces (per person) of your favorite artisan bread into 1-inch thick pieces. Sourdough bread is recommended. Coat each side of the bread with olive oil and spread evenly on a baking sheet.
Bake the bread for 5 minutes per side until the edges get slightly browned and the interior begins to get crisp.
Once the bread is baked, sprinkle with a pinch of salt while still warm.
Serve two pieces of crunchy oven-baked toast with each bowl of soup.