Salmon Mac and Cheese Recipe

Name: Salmon Mac and Cheese Recipe
Ingredients: 1 (16 oz) package elbow macaroni; 1/4 cup butter, softened; 1 tbsp olive oil; 1 small onion, minced; 1 (6 oz) can salmon, drained and flaked; 1 tbsp seafood seasoning (such as old bay); 1 tbsp red wine vinegar; 2 1/2 cups shredded cheddar cheese; 2 eggs, beaten; 2 cups milk; 1/2 cup vegetable stock; 1 (14.5 oz) can peas and carrots, drained; 1 (8 oz) can whole kernel corn, drained; salt and pepper to taste; 3 slices day-old bread; 3 tbsp grated parmesan cheese