Baked Eggs and Beans on Toast

Name: Baked Eggs and Beans on Toast
Ingredients: 2 tablespoons extra-virgin olive oil, plus more for brushing; 1/2 small onion, chopped; 1 tablespoon tomato paste; 2 tablespoons apple cider vinegar; 1 tablespoon honey mustard; 2 teaspoons Worcestershire sauce or steak sauce; Kosher salt and freshly ground pepper; 2 15-ounce cans navy beans (1 undrained; 1 drained and rinsed) (see Cook's Note); 8 large eggs; 4 thick slices crusty bread; 2 cups halved grape tomatoes; 1/4 cup chopped fresh parsley