Add a few dollops of butter to top.
Reheat in oven until hot and bubbly. Vegetables are only al dente so heat thoroughly.
Heat on stovetop to warm.
I ended up w way more spuds than needed for the topping so I sent some along. Reheat in oven if you don’t mind a crunchy top layer. Add dollops of butter to lessen that effect.
Have been frozen so bring to room temperature.