Preheat your oven to 425°F (218°C) and line a baking sheet with parchment paper.
Place the frozen cauliflower florets in a large bowl and toss them with 1 tablespoon of olive oil, salt, and black pepper until the florets are evenly coated.
Spread the florets evenly on the prepared baking sheet, making sure they are not too crowded.
Place the baking sheet in the oven and bake for 20-25 minutes, or until the cauliflower is crispy and golden brown.
While the cauliflower is roasting, prepare the garlicky breadcrumbs. In a large skillet, heat the remaining tablespoon of olive oil over medium heat.
Add the minced garlic and sauté for 1-2 minutes, or until the garlic is fragrant.
Add the breadcrumbs to the skillet and toast them, stirring frequently, until they are golden brown and crispy.
Remove the skillet from heat and set it aside.
Once the cauliflower is done roasting, remove the baking sheet from the oven and transfer the cauliflower to a large bowl.
Add the toasted breadcrumbs to the bowl with the cauliflower and toss everything together until the cauliflower is evenly coated with the breadcrumbs.