Preheat the oven to 375°F (190°C).
Prepare the chicken filling:
In a large skillet, melt the butter over medium heat.
Add the diced onion and cook for 2-3 minutes until softened.
Stir in the flour and cook for another 1-2 minutes to form a roux.
Add liquids:
Gradually whisk in the chicken broth and heavy cream.
Bring the mixture to a simmer, stirring constantly, until it thickens (about 3-4 minutes).
Combine the filling:
Stir in the shredded chicken, mixed vegetables, garlic powder, dried thyme, salt, and pepper.
Cook for another 2-3 minutes until everything is heated through.
Assemble the pie:
Pour the chicken filling into a baking dish or keep it in the skillet if it’s oven-safe.
Arrange the biscuits on top of the filling, leaving a little space between each one.
Bake:
Place the dish in the oven and bake for 20-25 minutes, or until the biscuits are golden brown and cooked through.
Finish:
Brush the tops of the biscuits with melted butter for an extra golden finish.
Serve:
Let the pie cool for a few minutes before serving. Enjoy the comforting, hearty meal!