Preheat oven to 350°F and grease an 8"x8" or 10"x7" pan. Mix the 8-10 medium peaches, ½ cup brown sugar, 2 tablespoons cornstarch, 1 tablespoon lemon juice, and 1 teaspoon almond extract in a large mixing bowl. Make sure the peaches are well coated.
Mix 1 cup old-fashioned oats, ¾ cup brown sugar, ¾ cup all-purpose flour, 2 teaspoon ground cinnamon, and ½ teaspoon salt in a separate bowl until well combined. Add the ½ cup coconut oil, and incorporate with a fork or your hands until crumbs form.
Pour the peach mixture into the greased pan and spread into an even layer. Sprinkle evenly with the streusel. Bake uncovered in the preheated oven for 45-50 minutes, until the top is golden brown and the filling is starting to bubble.
Allow to cool for 15 minutes before serving.