The night before mix the flour and olive oil until coarse crumbs appear in a large bowl.
Pour in the milk and sourdough starter. Mix until combined.
Cover with plastic wrap and let the dough ferment for 8-24 hours.
The next morning, mix the salt, baking soda, and baking powder in a small bowl and pour over the scone dough.
Fold the dough a few times to incorporate.
Add the jalapenos and garlic and fold the dough a couple of times to mix in.
Turn dough on to a work surface and shape the dough into a circle that is about 1 to 1 1/2 inches thick.
Divide into 8 equal triangles using a bench scraper or knife.
Place on parchment lined baking sheet.
Brush the tops of the scones with milk or milk substitute.
Bake for 12-15 minutes until lightly golden brown.