- 1 cup all-purpose flour
- 1/2 cup old-fashioned oats
- 1/3 cup slivered almonds
- 1/3 cup plus 2 tablespoons sugar, divided
- 2 teaspoons baking powder
- 1/2 teaspoon kosher salt
- 6 tablespoons (3/4 stick) chilled unsalted butter, cut into 1/2″ cubes
- 1 cup chilled heavy cream, divided, plus more for brushing
- 1 1/2 teaspoons vanilla extract, divided
- 4 cups fresh strawberries, hulled, sliced
- 1 tablespoon Grand Marnier or other orange liqueur (optional)
- Preheat oven to 375°F. Line a baking sheet with parchment paper. Pulse flour, oats, almonds, 1/3 cup sugar, baking powder, and salt in a food processor until finely ground. Add butter; pulse until only pea-size pieces remain. Add 1/2 cup cream and 1 teaspoon vanilla; pulse until large moist clumps form. Transfer to a work surface.
- Knead until dough comes together, about 4 turns. Pat into a 4×6″ rectangle. Halve lengthwise, then crosswise into thirds. Arrange on prepared baking sheet. Brush with cream; sprinkle with 1/2 tablespoon sugar.
- Bake, rotating sheet halfway through cooking, until golden brown around edges and a tester inserted into center comes out clean, about 20 minutes. Set biscuits on a wire rack; let cool. DO AHEAD: Biscuits can be made 8 hours ahead. Store cooled biscuits airtight at room temperature.
- Meanwhile, combine strawberries, 1 tablespoon sugar, and Grand Marnier, if using, in a large bowl. Toss to coat. Let strawberries sit, tossing often, until juices release. Whisk 1/2 cup cream, 1/2 tablespoon sugar, and 1/2 teaspoon vanilla in a small bowl until peaks form.
- Cut warm or room-temperature biscuits in half; place bottom halves on plates. Divide whipped cream and strawberries over. Top with remaining biscuit halves.