Creamy Roasted Red Pepper Soup

Name: Creamy Roasted Red Pepper Soup
Ingredients: 2 tbsp. olive oil; 2 tbsp. butter; 1 whole medium yellow onion, chopped; 3 cloves garlic, minced; 2 tsp. fresh oregano, minced; 1 whole russet potato, peeled and chopped (optional); 2 16-ounce jars of roasted red peppers, drained and sliced; 2 tbsp. tomato paste; 1/2 c. white wine; 4 c. vegetable stock; 1/2 c. heavy cream; 1 tbsp. red wine vinegar; 1 tsp. salt, plus more to taste; 1/2 tsp. black pepper; Grated parmesan cheese, for serving; Fresh oregano leaves, for serving