Preheat the oven to 425 degrees(F).
In a large soup pot, heat the olive oil on medium high.
Add the peas, green beans, carrots, corn, and onions to the pot. Sauté, reducing the heat as needed until the carrots start to soften, about 5 minutes.
Add the vegan butter to the pot and let it melt, stirring it with the veggies.
Once the butter has melted, add the flour and stir to combine, making sure there is no dry flour left.
Sprinkle in the celery salt, pepper, and nutmeg, then stir to combine.
Pour the broth and non-dairy milk into the pot, and whisk to combine, making sure there are no lumps of flour.
Bring to a simmer, reduce heat to medium low and let it thicken. About 2-3 minutes.
Taste and adjust seasonings, adding more salt and pepper if needed.
Pour the pot pie filling into an 8x8 or 9x9 inch baking dish, and smooth it out evenly. Set aside.
Make a batch of vegan cheddar bay biscuits according to the recipe(link below) and then scoop about 2 tablespoon sized dollops all over the top of the filling.
Bake for 30-40 minutes or until the biscuits are golden brown and cooked through.