Preheat the oven to 350°F. Keep 3 Granny Smith apples and 3 Honeycrisp apples near 68°F to 72°F. Peel and core them then cut each apple into uneven 3/4-inch chunks. Toss for 2 minutes with lemon juice, pure maple syrup, cornstarch, ground cinnamon, ground nutmeg, pure vanilla extract and fine sea salt. Use broad folding motions so the Gluten Free Apple Crisp Almond Flour filling gets coated without bruising the fruit. Next, stop mixing when every piece looks lightly glossy and cinnamon freckles cling to the cut surfaces. A thin amber liquid may collect underneath but the apples shouldn't swim in juice. Let them stand only 5 minutes before assembly. Wait much longer and the salt and sugar draw excess water from the fruit. Brief mixing protects the apple structure because damaged cells release liquid too early.

Let the melted unsalted butter cool to about 100°F before mixing. Combine blanched almond flour, certified gluten-free old-fashioned rolled oats, chopped pecans, coconut sugar, ground cinnamon and fine sea salt. Pour in the butter and fold for 90 seconds to 2 minutes. Pinch several portions between your fingers so some crumbs form pea-size clusters while plenty of loose sandy crumbs remain between them. Then look for a mixture that's evenly moistened but still rough and irregular. The almond flour should deepen slightly from ivory to warm tan and the oats should glisten without appearing greasy. If you stir past 3 minutes the clusters become dense and the finished topping loses its craggy texture. Mix briefly because uneven crumb sizes create more crisp edges during baking.

Heat the oven to 350°F and transfer the coated apples into a 9-inch square off-white ceramic baking dish. Spread them into a loose layer about 1 1/2 inches deep. Then distribute the almond-oat mixture across the surface over 3 to 4 minutes. Leave a few narrow gaps where apple pieces remain visible. Don't press the Gluten Free Apple Crisp Almond Flour topping flat because compacted crumbs bake into a dense lid. The surface should look uneven with larger clusters near the center and finer crumbs falling into spaces near the edges. Keep the apple chunks casually overlapped instead of arranging them in rows. (I pressed my first topping smooth, the center stayed soft while the edges hardened.) If the crumble is packed down the trapped steam can't escape evenly. Loose layering preserves air pockets because steam can move through the topping.

Bake the assembled crisp at 350°F for 38 to 42 minutes on the center rack. At minute 25 rotate the dish 180 degrees so the outer edges color evenly. Don't stir or press the surface. The Gluten Free Apple Crisp Almond Flour should keep distinct crumble clusters while heat softens the apples and activates the cornstarch underneath. Start checking the center through an exposed apple gap at minute 38. Finally, look for deep golden edges and medium-gold crumbs across most of the top. Thick amber bubbles should rise around at least three sides and the apples should yield when pierced. You'll smell toasted pecans and cinnamon as the butter-rich topping finishes browning. Pull it by minute 42 if the nuts darken quickly or they'll taste bitter. Bake at 350°F because steady heat thickens the filling before the nuts scorch.

Rest the baked crisp for 20 minutes until the filling settles and the center cools to roughly 135°F to 145°F. Scoop one sixth onto a white dessert plate while keeping both apple chunks and crumble together. Add one rounded scoop of vanilla bean ice cream beside the warm portion. The Gluten Free Apple Crisp Almond Flour should hold softly on the plate rather than spreading into a thin puddle. Watch the ice cream soften at its lower edge while the upper scoop keeps its shape. The apples should look glossy and tender with distinct irregular pieces underneath crisp clusters. Serve by minute 30 for the strongest warm-cold contrast. Scoop too early and the hot thickened juices run away from the fruit. Rest 20 minutes because cooling lets the starch network hold the apple juices.