Cook the diced bacon until crispy. Set aside to drain on paper towels.
Preheat the oven to 400 F (200 C). Line a baking sheet with parchment paper.
In a medium-large bowl whisk together flour, oats, salt, baking powder and garlic powder.
Add the butter cubes, and using a pastry cutter or fork, cut the butter until the pieces are no bigger than peas.
Add the grated cheese, cooked crispy bacon and green onion and just give a quick stir to combine with the flour mixture.
Add the beaten egg and buttermilk to the flour mixture and stir until just combined. Don't overmix.
Transfer dough onto a floured surface. Shape into a circle of about 8 inches (20 cm) in diameter, then cut into 8 triangles.
Transfer the scones to the baking sheet. Brush the top with olive oil. Sprinkle oats and salt over them.
Bake for about 18-20 minutes until golden brown.
Transfer to a cooling rack. The scones are best served warm. Enjoy!