Set your oven temperature to 425°F.
Arrange the broccoli florets, minced garlic, smoked sausage slices, and 2 teaspoons of the fresh herbs on a lined baking sheet. Drizzle everything with olive oil and sprinkle with salt and black pepper; toss well to coat evenly.
Spread the mixture out so it forms a single layer and roast it in the oven for about 20 minutes until the broccoli develops a golden-brown crust.
Take the sheet out and add the chopped bell peppers. Toss them with the other ingredients and spread the mixture back into an even layer.
Return the pan to the oven and cook for another 15 to 20 minutes until the sausage edges crisp up and the veggies are tender.
Once done, sprinkle with the remaining teaspoon of fresh herbs and add Parmesan cheese if you’d like before serving.