01 -
Whisk together gluten-free flour, almond flour, and kosher salt in a small bowl. Set aside.
02 -
In a stand mixer with paddle attachment, beat room-temperature butter and powdered sugar until smooth, avoiding overmixing.
03 -
Add the room-temperature egg and mix until incorporated. Gradually add the dry mixture on low speed until a cohesive dough forms.
04 -
Transfer dough to a clean surface, shape into a 1-inch thick disk, wrap in plastic, and refrigerate for at least 1 hour or up to 3 days.
05 -
On floured parchment, roll out the dough to 1/8–1/4 inch thickness. Drape into a 9.5-inch tart pan, pressing into edges. Trim excess, leaving 1/4 inch overhang. Chill for 30 minutes.
06 -
Melt butter and allow to cool. Whisk together flour, brown sugar, pecans, cinnamon, and salt in a bowl. Gently mix in melted butter with a fork or spatula to form crumbles. Chill until needed.
07 -
Toss diced apples with lemon juice. Mix brown sugar, cornstarch, cinnamon, nutmeg, and salt in a bowl. Melt butter in a sauté pan, add apples, and cook 3-5 minutes until starting to soften. Stir in brown sugar mixture and vanilla; cook until thickened. Cool completely.
08 -
Preheat oven to 350°F. Poke crust bottom with a fork. Cover with parchment or foil and fill with pie weights. Bake for 15 minutes. Remove weights and parchment, raise oven to 375°F. Bake 5–10 minutes more until golden. Cool on rack.
09 -
Mix gluten-free flour and granulated sugar in a small bowl. Sprinkle evenly over the cooled tart shell.
10 -
Spread cooled apple filling evenly into the crust, avoiding excess juices. Drizzle caramel sauce in a swirl from center to edge.
11 -
Top apples with chilled pecan streusel. Bake at 375°F for 15 minutes, then lower to 350°F and continue baking 32–38 minutes, until streusel is golden and filling bubbles. Internal fruit temperature should reach at least 200°F.
12 -
Let tart cool at least 2 hours in the pan before removing and slicing for serving. Filling will set as it cools.