Hearty Chicken Pot Pie

1 (10.75oz) can condensed chicken broth
1 1/3 C water, divided
4 medium carrots, thinly sliced (about 1 1/2 cups)
3 medium red potatoes, scrubbed and diced (about 1 1/2 cups)
2 Tbsp olive oil
2 C quartered medium mushrooms
1 medium onion, coarsely chopped
1 C frozen peas
1/3 C all-purpose flour
1 refrigerated unbaked pie crust (for 9" pie)
2 1/2 C chopped cooked chicken

Combine broth, 1 cup water, carrots and potatoes in medium saucepan. Bring to a boil; reduce heat and simmer over low heat 10 minutes. Preheat oven to 425. Heat oil in large skillet over medium heat. Add mushrooms and onion; saute until softened, about 5 minutes. Stir in broth mixture and peas. Whisk remaining 1/3 C water into the flour until smooth; whisk into vegetable mixture. Increase heat to medium-high; bring to a boil. Spread out pie crust on floured surface. Measure and roll, if necessary, to fit 1-inch larger than top of 2-quart shallow baking dish. Stir chicken into vegetable mixture and transfer to baking dish. Place crust over filling; trim and flute edge. Cut a scalloped round from center with a cookie cutter. Bake until filling is bubbly and crust is browned, about 20 minutes.