Slice Tribeca Oven Multigrain Loaf widthwise into eight 1/2-inch-thick slices. Set aside until ready to build the sandwich.

In a small bowl, mix mascarpone, dill and chives together until smooth. Season with salt and pepper, to taste.

To build the sandwich, coat one side of each bread slice evenly with mascarpone mixture. Evenly layer cucumber and radishes between 4 bread slices, mascarpone-side-up. Top with remaining bread slices, mascarpone-side-down. Slice and serve.