Preheat oven to 400 degrees fahrenheit. If your oven runs extra hot and has a tendency to obliterate your food, try 375.

Prep your ingredients - peel and chop your onion and crush your garlic, set aside. Rinse, peel and slice carrots into thin coins. Measure out peas and let them sit at room temperature. Roughly chop basil and set aside separately.

Lightly rinse a large saucepan and shake out excess water into the sink. Set it on low-medium heat on the stove. Once water droplets have evaporated, melt 1/2 stick of butter plus 1 tbs olive oil in pan. Let it heat thoroughly for a couple of minutes. Stir or swirl the pan for even heat distribution and to prevent premature browning or burning. Adjust heat as needed.

In a separate container, mix half and half and tapioca flour together. Whisk until blended and smooth. Gently pour into pan and stir.

Carefully take premade top crust and cover the filling. Using your index fingers and thumbs, firmly pinch the edges to seal the top of the pie. You can trim excess dough with food-safe scissors. Take a fork or butter knife and gingerly make 3 small slits starting at the center of the pie and outward to create ventilation. Evenly brush the top and edges with prepared egg-wash or water.

Cover the edges of the pie crust with foil to prevent premature browning. Place pie in heated oven on the center rack, and place a foiled cookie sheet on the rack below to catch any drips. Let bake for 35-40 minutes.