Drain and rinse the white beans.
Blanch the asparagus and chop into 1-inch pieces.
Prepare an ice water bath for the asparagus.
Finely chop fresh oregano and slice shallot.
Cut Castelvetrano olives into quarters.
Make the dressing by whisking together vinegar, Dijon mustard, and olive oil.
Add the rest of the ingredients and toss gently to coat.
Let the salad sit for at least ten minutes.
Crumble feta cheese over the top of the salad.
Heat olive oil in a skillet and toast the bread slices.
Serve the salad over the toasted bread.
