Cut the block of feta cheese into roughly 1-inch cubes.
Place the feta cubes and mixed olives in a medium serving dish or shallow bowl.
In a small bowl, whisk together the olive oil, dried oregano, dried thyme, a pinch of salt (if using), and a pinch of black pepper.
Gently warm the olive oil mixture by placing the bowl over a warm water bath or heating it in a small saucepan over very low heat until warm to the touch, not hot.
Remove from heat and whisk in salt and pepper.
Pour the warm marinade evenly over the feta and olives, coating well.
Tuck fresh thyme sprigs among the feta and olives for aroma and appearance.
Let the marinated feta sit at room temperature for at least 30 minutes before serving to develop flavors.
For stronger flavor, refrigerate for a few hours or overnight, then bring back to room temperature for 30 minutes before serving.
Serve with crusty bread or crackers.