Spinach, Red Pepper, And Feta Quiche
["1/2 c. plus 3 Tbsp. all-purpose flour", "3 Tbsp. cold, unsalted butter", "1 Tbsp. cold vegetable shortening", "1 1/2 Tbsp. ice water, plus additional if necessary", "1/3 c. sliced red bell pepper", "1 Tbsp. olive oil", "2 c. packed, fresh spinach leaves, trimmed and washed thoroughly (about 5 oz.)", "2 large eggs", "1/3 c. heavy cream or milk", "1/3 c. crumbled Feta cheese"]
["Preheat oven to 425\u00b0."]
["flour", "cold", "cold vegetable shortening", "water", "red bell pepper", "olive oil", "fresh spinach leaves", "eggs", "heavy cream", "Feta cheese"]