Preheat your oven to 375°F (190°C) and prepare an 8x12 inch baking pan by lining with baking paper.

Combine the plain Greek yogurt and softened unsalted butter in a large mixing bowl and blend until smooth.

Add eggs one at a time to the mixture, ensuring each is fully incorporated before adding the next.

Whisk together the almond flour, baking soda, xanthan gum, and garlic powder in a separate bowl.

Fold the dry mixture into the wet ingredients using a spatula until just combined.

Transfer the dough into the lined baking pan and flatten it evenly.

Sprinkle flaky salt and dried rosemary on top, then drizzle remaining olive oil across the surface.

Bake for 20-25 minutes until lightly golden and set in the center. Allow to cool slightly before slicing.

Remove from the pan using baking paper, transfer to a cutting board, slice, and serve warm or at room temperature.