**Making the Crust:**

1. Combine Dry Ingredients: In a large bowl, whisk together the flour and salt.

2. Cut in the Butter: Add the cold butter cubes to the flour mixture. Using a pastry blender or your fingertips, cut the butter into the flour until the mixture resembles coarse crumbs. You should still see small pieces of butter.

3. Add Ice Water: Gradually add the ice water, one tablespoon at a time, mixing until the dough just comes together. Be careful not to overmix!

4. Shape and Chill: Form the dough into a disc, wrap it in plastic wrap, and chill in the refrigerator for at least 30 minutes.

5. Roll and Transfer: On a lightly floured surface, roll the dough out to a 12-inch circle. Carefully transfer it to a 9-inch tart pan with a removable bottom. Press the dough into the bottom and up the sides of the pan.

6. Trim and Prick: Trim any excess dough from the edges. Use a fork to prick the bottom of the crust several times.

7. Pre-bake: Preheat your oven to 375°F (190°C). Line the tart crust with parchment paper and fill it with pie weights or dried beans. Bake for 15 minutes. Remove the parchment paper and weights and bake for another 5-10 minutes, or until the crust is lightly golden brown. Let cool completely.

**Making the Filling:**

1. Heat the Cream: In a saucepan, heat the heavy cream over medium heat until it just begins to simmer. Do not boil!

2. Melt the Chocolate: Remove the cream from the heat and pour it over the chopped white chocolate in a heatproof bowl. Let it sit for a minute to soften the chocolate.

3. Whisk Until Smooth: Gently whisk the mixture until the chocolate is completely melted and the filling is smooth and glossy.

4. Temper the Egg Yolks: In a separate bowl, whisk together the egg yolks and sugar until pale and slightly thickened. Gradually whisk a small amount of the hot white chocolate mixture into the egg yolk mixture to temper the eggs (this prevents them from scrambling).

5. Combine and Flavor: Pour the tempered egg yolk mixture back into the remaining white chocolate mixture. Whisk to combine. Stir in the vanilla extract.

6. Pour into Crust: Pour the white chocolate filling into the cooled tart crust.

**Making the Cranberry Topping:**

1. Combine Ingredients: In a saucepan, combine the cranberries, sugar, water, orange zest, and cinnamon.

2. Cook Until Thickened: Bring the mixture to a boil over medium heat, then reduce the heat and simmer for 10-15 minutes, or until the cranberries have burst and the sauce has thickened. Stir occasionally to prevent sticking.

3. Cool Slightly: Let the cranberry topping cool slightly before spooning it over the white chocolate filling.

**Putting it All Together:**

1. Top with Cranberries: Spoon the cooled cranberry topping evenly over the white chocolate filling.

2. Chill: Cover the tart loosely with plastic wrap and chill in the refrigerator for at least 2 hours, or preferably overnight, to allow the filling to set completely.

**Serving:**

Let the tart sit at room temperature for about 15-20 minutes before serving. Dust with powdered sugar or garnish with fresh mint leaves, if desired. Serve with vanilla ice cream or whipped cream for an extra treat.