Creamy Dijon Roasted Potato Salad

2 lbs. Yukon gold potatoes, cut into wedges3 T. olive oil, divided2 T. sliced fresh garlic1 T. minced fresh thymeKosher salt, black pepper2 T. white wine vinegar3 T. minced shallots1 T. Dijon mustard2 t. chopped fresh tarragon1. Place heavy baking…