Set your oven to 200°C (390°F) and place a block of feta cheese in the middle of a large ovenproof pan.
Pour 1 tablespoon of olive oil over the feta and let it roast in the oven for about 8 minutes until it softens.
Add the halved cherry tomatoes and asparagus pieces around the feta, drizzle with the remaining olive oil, and roast everything together for another 15 minutes until the vegetables are tender.
While the veggies roast, cook the orzo pasta according to package instructions until al dente, then drain and set aside.
Once the feta and vegetables are roasted, mix them with the cooked orzo right in the pan, stirring gently to coat the pasta with the soft feta and juices.
Fold in the chopped basil, fresh chives, mascarpone cheese, and baby spinach, seasoning with salt and pepper to your taste.
Serve warm, garnished with a bit more fresh herbs if desired for a fresh, vibrant finish.