How to Make It
Make the whipped feta. Combine the feta cheese, cream cheese, and garlic in the bowl of a food processor, and pulse until the cheeses are whipped and the garlic is finely chopped; season with salt and pepper to taste. With the motor running, add the olive oil in a slow stream until emulsified.
Preheat the oven to 425°F.
Brush each slice of bread with olive oil. Put the bread on a baking sheet and bake until crisp and lightly golden around the edges, 5 to 6 minutes.
Top each slice of toast with whipped feta, arugula, smoked salmon, red onion, and capers, dividing the toppings evenly. Serve immediately.