While heating, cook bacon in a large skillet until crisp. Put in on a plate lined with paper towels to drain. Also drain most of the oil from pan, leaving a small amount for the onions. When cool, crumble bacon and set aside.
Meanwhile, cook onion in bacon drippings until translucent. Set aside.
Cover the pie crust with two layers of foil and bake in oven for eight minutes. Do not prick the crust as indicated on the original packaging.
Meanwhile, in a large bowl, beat eggs, milk, and salt together. Stir in crumbled bacon, onion, shredded cheese, flour, and thyme and cayenne pepper.
Remove foil from crust, and bake until crust is dry. It doesn't have to be golden, just cooked (dry).
Remove from oven and reduce temperature to 325 degrees.
Pour egg mixture into the hot, baked crust. Add the goat cheese in small bits over the top and bake for 45-50 minutes or until a knife inserted near the center comes out clean. If necessary, cover the edge of crust with foil to prevent over browning. Let stand 10 minutes before serving.
You can optionally take out the thawed, pre-made dough, roll it out, and place in a 9" tart pan. If using the kind with a pop out bottom, be sure to line a cookie sheet with foil and place this pan on top, as a little will drip out.