In a medium-sized bowl, combine softened cream cheese, Greek yogurt, finely chopped chives, fresh dill, and a pinch of ground pepper. Mix until smooth and creamy, about 2-3 minutes.

Lightly toast slices of whole wheat bread until golden brown, about 3-4 minutes.

Wash and slice your tomatoes into ¼-inch thick rounds using a sharp knife.

Spread a generous layer of the creamy mixture on one side of each slice. Layer the tomato slices on one piece, and top with the second slice of bread.

Cut the sandwich diagonally for easier handling, and serve immediately.