Preheat oven to 425F. Line a large sheet pan with parchment paper. Arrange chopped potatoes, apples, full garlic cloves and onion on the sheet pan. Drizzle with olive oil and 1 1/2 tsp salt and 1/2 tsp ground pepper.
Once everything is roasted, add to a blender along with vegetable stock paste, water, milk, 1 1/2 cups shredded cheese, 1 tsp salt and 1/2 tsp pepper to a blender. Blend until smooth and add more water if needed to make the soup smoother.
Add blended soup to a large soup pot and warm over medium-low heat until a desired temperature. Serve the soup garnished with fresh dill, chili flakes, cheddar cheese, apple and/or drizzle of olive oil. Optional: brulee the top of the soup once the shredded cheese is added.
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Notes
To make the soup creamier, try using cream instead of whole milk or to make it lighter try 2% milk.Easily make this soup ahead of time, store in the fridge for up to 3 days and reheat on medium-low heat in a soup pot then top with garnishes to serve.