Step 1

Preheat oven to 425°F.

Step 2

Melt butter in a large cast-iron skillet over medium-high. Stir in flour until smooth.

Step 3

Stir in vegetables, broth, cream, chicken, and thyme. Bring to a boil.

Step 4

Remove from heat, and place pastry sheet over top of skillet.

Step 5

Bake in preheated oven until golden brown and bubbling, about 18 minutes.