Delicious French Onion Tart Recipe - Quickie Recipe

Ingredients

• 2 cups all-purpose flour.
• ½ teaspoon kosher salt.
• 1 tablespoon sugar.
• 12 tablespoons cold unsalted butter, diced (1 ½ sticks).
• ½ cup ice water.
• 1 cup Gruyère cheese, shredded (4 oz).
• 1 ½ teaspoons fresh thyme, minced.
• 2 teaspoons fresh chives, minced.
• 1 ¼ lbs sweet onions (about 3 medium onions).
• 1 tablespoon heavy cream.
• 3 tablespoons unsalted butter, diced.
• 1 teaspoon kosher salt.