In a mixing bowl, combine cream cheese, Greek yogurt, chives, and dill. Stir until smooth.

Preheat toaster or oven. Toast the whole wheat bread until golden brown, about 3-4 minutes.

Wash and dry the tomatoes, then slice into ¼-inch rounds carefully.

Spread the herby mixture on one side of each slice of toasted bread, top with tomato slices, and close the sandwich.

Sprinkle chopped dill or chives on top of the tomatoes, season with flaky sea salt or red pepper flakes, and serve immediately.