How to Make It
Preheat broiler to high. Broil multigrain bread until edges begin to brown. Heat olive oil in a skillet over medium-high. Add thinly sliced shallots; cook, stirring often, until crisp and brown, 3 to 5 minutes. Remove from heat; stir in chopped parsley, chopped tarragon, white balsamic vinegar, and grated Manchego cheese. Divide mixture among toasts. Broil until cheese melts, about 2 minutes.