Bring a large pot of salted water to a boil. Dissolve the vegetable stock cube in the water for extra flavor.
Add the gluten-free pasta and cook according to the package instructions (about 8-10 minutes).
During the last minute of cooking, toss in the green beans to blanch them together with the pasta.
Drain the pasta and beans, reserving ¼ cup of pasta water for the sauce.
Return the pasta and beans to the pot. Stir in the smoked salmon, baby spinach, spring onion, and soft cheese.
Gradually add the reserved pasta water to loosen the cheese and create a luscious, creamy sauce.
Squeeze fresh lemon juice over the pasta for brightness, and season with salt and pepper to taste.
Serve immediately, sprinkling grated parmesan on top for a salty, nutty finish.