1. Combine whole wheat flour, all-purpose flour, 1/4 cup butter, 1 egg, sour cream, and 1/4 teaspoon salt in a bowl; knead until dough comes together. Shape dough into a ball. Wrap in plastic wrap and refrigerate until firm, at least 1 hour and up to overnight. 2. Roll out dough into a 10-inch circle on a lightly floured work surface. 3. Grease a 9-inch tart tin with 1 teaspoon butter. Press dough into the tart tin. Trim edges with a sharp knife. Place crust in the refrigerator. 4. Preheat oven to 350 degrees F (175 degrees C). 5. Heat olive oil in a large skillet over high heat. Add zucchini; cook and stir until just tender, 3 to 5 minutes. Season with thyme, salt, and pepper. Remove from heat. 6. Mix ricotta cheese and 1 egg together in a bowl. Fold in zucchini and Parmesan cheese gently. 7. Sprinkle bread crumbs over chilled crust; cover with prosciutto slices. Spread ricotta-zucchini mixture evenly over prosciutto. Smooth the top with a spatula; sprinkle pine nuts on top. 8. Bake in the preheated oven until center is firm and top is golden, about 35 minutes. Let stand for 10 minutes before slicing. ---------------------------------------------------------------------------
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