Chanterelle quiche with dorblu & thyme

Ingredients

• 3 tablespoons (45 milliliters) cold water
• 120 grams (1/2 cup or 4.2 ounces) butter (chop into small pieces and freeze)
• 1 small egg
• Pinch of salt
• 1/5 teaspoon (0.4 grams) baking powder
• 285 grams (2 1/4 cups or 10 ounces) flour (plus gradually add a little more)
• 250 grams (8.8 ounces) chanterelles (or other mushrooms)
• 150 grams (2/3 cup or 5.3 ounces) cream (33%)
• 2 eggs
• 50 grams (1.8 ounces) parmesan
• 8 sprigs thyme (use only green leaves)
• 70 grams (2.5 ounces) Dorblu cheese
• 1 small onion
• 50 grams (3.5 tablespoons or 1.8 ounces) butter