Pastry: In bowl, mix together all-purpose flour, spelt, icing sugar and salt. Crumble in butter using fingers or 2 knives. Drizzle in water, stirring with fork until dough comes together. Wrap in plastic wrap and refrigerate for 1 hour.
Filling: Preheat oven to 350°F. In bowl, toss strawberries with sugar, cornstarch and vanilla powder. Set aside.
On lightly floured surface, roll out dough to 3- to 4-mm thickness. Using plate or bowl, cut out eight 13-cm circles. Arrange on parchment-paper-lined baking sheet. Sprinkle 11⁄2 tsp of the almond flour over each circle. Top with the strawberry mixture, leaving a border around the edge. Fold over pastry edge, lightly pressing to keep dough in place. Freeze for 10 minutes.
In small bowl, whisk egg with milk; brush over pastry, then sprinkle pastry with sugar. Bake galette until edges are golden brown and filling is bubbly, 25 to 30 minutes. Serve with vanilla ice cream.
Notes
Tip: This recipe makes eight small galettes. To make a large galette, simply roll the pastry dough into one 3-mm-thick round and follow the recipe, baking for 45 to 50 minutes.