In a 9-inch pie plate, or a baking dish, combine strawberries, blueberries, lemon juice, sugar, cornstarch and salt; let stand 10 minutes.
In a mixing bowl, whisk the flour, baking powder, sugars, lemon zest, and melted butter. Mix with a wooden spoon until crumbly.
Add the crumbly topping over the fruit mixture. Sprinkle sliced almonds and raw sugar over topping.
Place the pie plate/baking dish on the previously prepared baking sheet.
Bake for 40 to 45 minutes, or until the topping is golden brown and the fruit is bubbly.
Remove from oven and let stand for 10 minutes.
Serve with a dollop of ice cream or whipped cream.
Notes
Choose Ripe Berries: The quality of your fruit will greatly influence the taste of your crumble. Use ripe but firm berries for the best flavor and texture.
Add a Thickener: To avoid a soggy crumble, use a thickening agent like cornstarch or flour in your fruit mixture. This will help absorb some of the juices released by the berries when they bake.
Chill Your Topping: To achieve a perfectly crispy and crunchy crumble, chill your topping before sprinkling it over the fruit. This will help it hold its shape as it bakes.
Don’t Over Mix: When preparing the crumble topping, mix until you have a chunky, crumbly texture. Over-mixing will lead to a more cohesive dough, which won't give you the desired crumbly finish.
Serve Warm or Cold: Strawberry Blueberry Crumble can be enjoyed both warm and cold. If serving warm, consider adding a scoop of vanilla ice cream on top. If serving cold, a dollop of whipped cream pairs wonderfully.
Store Correctly: Store any leftover crumble in the fridge, covered, for up to 3-4 days. You can reheat individual portions in the oven or microwave when ready to enjoy again.