Step 1

Preheat the oven to 400°F. Line a small sheet pan with parchment paper.

Step 2

In a medium bowl, whisk together the yogurt, Parmesan, salt, and egg. Arrange the bread slices on the prepared pan. Using your fingers, press the center of each bread slice out to the edge to flatten the interior of each slice to form a slight well. Spoon the yogurt mixture evenly over the bread slices; top evenly with the tomatoes, cut sides up, and the chives. Bake at 400°F until set, about 10 minutes. Sprinkle with black pepper, if desired.

Step 3

Serving size: 1 toast