Preheat oven to 425ºF.
Line a large baking sheet with parchment paper.
Chop broccoli, mushrooms, leeks, & onion (if using) to your desired size.
Place chopped veggies in a medium bowl, drizzle with olive oil, then season with basil, rosemary, salt, & pepper; gently toss to coat.
Cut sausages to your desired size, add them to the bowl, followed by the gnocchi.
Toss everything together one final time then lay the mixture on your sheet pan.
Bake for 30 minutes, tossing everything once halfway through.
While the gnocchi is cooking, prepare the pesto. You can find the steps here. Place in the fridge until the gnocchi is ready. Remove the baking sheet from the oven. Add your pesto straight to the pan (be careful not to burn yourself) & thoroughly toss everything together, mixing the pesto throughout.
Divide into your serving bowls, & pair with 1/2 a burrata cheese ball, if preferred.
Top with fresh lime juice & enjoy!