Preheat your oven to 400°F (200°C).
Season the chicken breast with a pinch of sea salt and black pepper, then pan-sear in a non-stick skillet over medium-high heat for 6-7 minutes per side until cooked through.
While the chicken is cooking, finely mince the garlic cloves and chop the fresh rosemary and thyme.
In a small bowl, whisk together the olive oil, half of the minced garlic, and the chopped fresh herbs.
Brush the herb-garlic oil mixture onto both sides of the sourdough bread slices and place them on a parchment-lined baking sheet.
Toast the bread in the oven for 8-10 minutes until the edges are golden brown and crisp.
Once the chicken is finished, shred it using two forks and place it into a medium mixing bowl.
Add the Greek yogurt, remaining minced garlic, lemon juice, sea salt, and black pepper to the shredded chicken and stir until well combined.
Spread the creamy chicken mixture evenly over the warm, roasted sourdough slices and serve immediately.