Preheat the oven to 230°C.
On a rimmed baking sheet, spread out the tomatoes and toss with olive oil. Sprinkle tomatoes with salt, pepper, garlic powder, onion powder, and dried oregano.
Roast the tomatoes for 15–20 minutes, or until lightly charred and softened.
Whip the feta. In a blender or food processor, combine the feta, crème fraîche, cream cheese, lemon zest, and lemon juice. Purée until smooth. Taste and add some salt if needed.
Assemble the dip. Spread the whipped feta dip in a shallow dish. Pile the roasted tomatoes in the center, drizzling over some extra olive oil for finish. Garnish with fresh chopped oregano leaves.
Serve with crackers or crostini. Enjoy!