Combine all the olives, capers, garlic, herbs, lemon juice, and olive oil in a food processor. Pulse until coarsely chopped, about 30 seconds.
Taste the tapenade and stir in extra lemon juice or salt if needed.
Preheat your oven to 375°F (190°C). Arrange thin baguette slices on a baking sheet.
Brush lightly with olive oil on each side.
Bake for 8–10 minutes until golden brown, flipping halfway through.
Spread a generous layer of tapenade onto each warm crostini. Optionally, sprinkle with grated Parmesan or fresh thyme.
