Preheat the oven to 400°F.
Place the Boursin in the center of a 9 × 13-inch baking dish. Arrange the uncooked tortellini, frozen vegetables and shredded chicken around it.
Pour the 1.5 cup of water evenly over the tortellini mixture. Cover tightly with foil and bake for 30 minutes, or until the tortellini is tender and the chicken is heated through.
Carefully remove the foil and stir until the melted Boursin coats the tortellini, vegetables and chicken.
Sprinkle with shredded cheese and bake uncovered for another 5 minutes, or until melted. Serve warm.