1-Preheat your oven: Preheat your oven to 375°F (190°C) to ensure it’s ready when your crisp is assembled.

2-Grate the lemon rind and squeeze juice: Grate the lemon rind and squeeze juice from half the lemon, being careful to remove any seeds.

3-In a medium bowl, toss blueberries: In a medium bowl, toss blueberries with 2 tablespoons granulated sugar, lemon zest, 1 tablespoon lemon juice, and 3 tablespoons flour until well combined.

4-Transfer the blueberry mixture: Transfer the blueberry mixture to a 2-quart baking dish and spread evenly.

5-Combine topping ingredients: In a separate bowl, combine ¼ cup softened butter, ½ cup brown sugar, ¾ cup oats, ¼ cup flour, ½ cup sliced almonds (if using), and ¼ teaspoon cinnamon.

6-Use a fork to mix: Use a fork to mix these ingredients together until they form a crumbly texture similar to wet sand.

7-Sprinkle the topping mixture: Sprinkle the topping mixture evenly over the blueberries, covering them completely.

8-Bake: Place the baking dish in the preheated oven and bake for 35-40 minutes.

9-Check for doneness: The crisp is done when the topping is golden brown and the fruit filling is bubbling around the edges.

10-Remove and cool: Remove from the oven and let it cool slightly before serving warm.