Zucchini Cheddar Quiche
["1 frozen 9-inch deep dish pie shell, thawed", "1 medium onion, chopped (1/2 c.)", "1 Tbsp. butter or margarine", "1 1/2 c. packed coarsely shredded zucchini (8 oz.)", "1/2 tsp. oregano", "1/4 tsp. thyme", "3/4 tsp. salt", "1/4 tsp. pepper", "3 eggs", "2 Tbsp. grated Parmesan cheese", "1 1/2 c. half and half", "1/2 c. coarsely shredded sharp Cheddar cheese (2 oz.)", "2 rectangular slices Cheddar cheese, each cut in 2 triangles"]
["Preheat oven to 425\u00b0.", "Recrimp pie shell in its aluminum pan, making high fluted edge, or transfer pastry to 4-cup square baking pan and crimp edges."]
["dish pie shell", "onion", "butter", "zucchini", "oregano", "thyme", "salt", "pepper", "eggs", "Parmesan cheese", "Cheddar cheese", "rectangular slices Cheddar cheese"]