Step 1Grease a 12-inch diameter quiche dish, cake pan or springform pan with oil. (If using springform pan, set on baking sheet.) Slightly overlap potato slices to cover bottom of dish. Sprinkle with salt and pepper to taste. Slice meatloaf into 1/3-inch-thick slices and layer over potatoes--tuck any leftover little pieces into nooks and crannies. Layer with bread pieces, chopped spinach, feta, tomatoes and sprinkle with oregano.
Step 2Combine eggs, wine, sour cream, green onions, cinnamon and nutmeg. Season with salt and pepper to taste. Spoon over quiche base, spreading evenly over top. Bake at 375 degrees until top is evenly brown, 40 minutes. Let cool slightly. Cut into 6 wedges.