Preheat oven to 350°F conventional. Spray a standard 9 x 5 inch loaf pan with nonstick cooking spray and set aside.
Rinse and dry the strawberries. Remove stems and cut into a small dice, about 1 centimeter cubed. Place in a small bowl and set aside.
In a medium bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon. Set aside.
In a large bowl, combine the buttermilk, eggs, vanilla, sugar, and warm coconut oil. Vigorously whisk until smooth and fully emulsified.
Add the dry ingredients to the wet ingredients and whisk just until a smooth batter forms. Stop whisking as soon as no dry streaks remain.
Toss the diced strawberries in the 2 tablespoons of flour, then scoop them into the batter, being careful not to add any extra flour from the bottom of the bowl.
Gently fold the strawberries into the batter. Dollop and spread the batter into the prepared loaf pan, making sure batter with plenty of strawberries ends up on top, not just the bottom.
Sprinkle with sparkling sugar if using.
Bake for approximately 55 minutes, rotating the pan once at the 45-minute mark. The loaf is done when a toothpick comes out with a few clinging crumbs and the center offers light resistance when touched.
Cool in the pan for 10 minutes, then turn out onto a wire rack to cool completely. Use a serrated knife for the cleanest slices.