Start by warming up your oven to 375°F (190°C). This ensures a perfect bake for your crisp, allowing the blueberries to bubble and the topping to turn golden brown.

While the oven heats, let’s get our blueberries ready! If you're using fresh berries, rinse them gently in cold water. Then, in a large mixing bowl, combine those blueberries with 2 tablespoons of granulated sugar, the zest of one lemon, one tablespoon of freshly squeezed lemon juice, and 3 tablespoons of all-purpose flour. Toss everything together delicately, ensuring the blueberries are evenly coated. Once mixed, transfer this berry goodness into a 2-quart baking dish.

Now, for the topping—let’s get crumbly! In a separate mixing bowl, use a fork to combine the softened butter, brown sugar, rolled oats, the additional ¼ cup of flour, sliced almonds (if using), and the ground cinnamon. Mix until you achieve a crumbly texture, with the butter distributed well throughout.

Sprinkle that delicious topping generously over the blueberries. It’s like giving the blueberries a cozy blanket! Slide the baking dish into the preheated oven and bake for 35 to 40 minutes. You’re looking for a topping that’s nice and golden-brown, and fruit bubbling up around the edges.

Once done, pull the crisp from the oven and let it cool slightly. It’s tough, but this will allow the juices to settle just a bit. Serve warm—perhaps with that scoop of vanilla ice cream we chatted about.