Prepare Cherry Filling: In a saucepan, combine cherries, granulated sugar, and cornstarch. Cook for 5-7 minutes until bubbly. Stir in lemon juice and almond extract, let cool.

Make Muffin Batter: Preheat oven to 400°F (200°C). In a bowl, whisk flour, sugar, baking powder, baking soda, and salt. Cut in cold butter until crumbly. In another bowl, mix buttermilk, egg, and vanilla. Combine with dry ingredients until just mixed.

Create Crumble Topping: In a bowl, mix flour, brown sugar, and cinnamon. Cut in cold butter until crumbly.

Assemble Muffins: Spoon batter into liners, add cherry filling on top, and sprinkle crumble. Bake for 18-22 minutes until a toothpick comes out clean.

Cool & Serve: Let muffins cool for a few minutes, transfer to a wire rack. Enjoy!