Heat your oven to 200°C (390°F) and set your oven-safe pan ready.
Put the block of feta in the center of the pan and drizzle with 1 tablespoon of olive oil.
Roast the feta in the oven for around 8 minutes until it starts to soften.
While the feta roasts, toss cherry tomatoes and asparagus with the remaining 2 tablespoons of olive oil in the pan around the feta.
Return the pan to the oven and roast everything together for about 15 minutes until the vegetables are tender.
Cook the orzo according to package instructions, then drain and set aside.
Once the feta and vegetables are done, stir in the cooked orzo, fresh spinach, basil, chives, and mascarpone cheese into the pan.
Season the mixture generously with salt and black pepper to taste.
Give everything a gentle mix to combine all flavors evenly before serving warm.