Cut mozzarella block into very thin rounds. Preheat the oven to 425°. Unpackage Amy’s frozen Vegan Margherita Pizza and place mozzarella rounds on top of frozen pizza. Place the pizza on a baking sheet or pizza stone and bake for 15 minutes.
While the pizza is baking, slice the asparagus into thin strips or chop into approximately 2-inch long pieces. Slice peppers into thin rings. Toss the asparagus and sweet peppers in olive oil in a large bowl. Distribute veggies onto a baking sheet lined with parchment paper.
Roast veggies in the oven at 425° for 15 minutes. Pull the pizza out and let it cool. When the veggies are sufficiently roasted (slight browning on the edges), remove veggies from the oven and set aside.
Scatter asparagus and pepper on top of the pizza. Finish by sprinkling crumbled feta and fresh thyme on top.