In a medium bowl, combine cream cheese, Greek yogurt, chives, dill, and ground pepper. Mix until smooth and creamy.

Lightly toast the whole wheat bread for 2-3 minutes until golden and crisp.

Slice the tomatoes into 1/4-inch rounds.

Spread the herb mixture on one side of each slice of bread.

Layer the sliced tomatoes on two slices of bread with the herb mixture, sprinkle with sea salt and red pepper flakes if desired.

Top with the remaining slices of bread, spread side down, and press gently to secure.

Cut the sandwich diagonally and serve, garnished with fresh herbs or additional tomatoes if desired.