Preheat oven to 400 F. Line two baking sheets with parchment paper
Toss sweet potatoes in a bowl with 2 tbsp olive oil, 1 tsp kosher salt, 1/2 tsp black pepper and 1 tsp garlic powder
Lay sweet potatoes in one layer on one baking sheet and place in oven for 30-35 minutes
Toss zucchinis with 1 tbsp olive oil, 1/2 tsp kosher salt, 1/4 tsp black pepper and 1 tsp garlic powder
Toss chinese eggplants with 2 tbsp olive oil, 1/2 tsp kosher salt, 1/4 tsp black pepper, 1 tsp oregano and 1 tsp basil
Lay eggplant and zucchini in a single layer on the second baking sheet (each taking one half of the sheet). Place in the oven for 20-25 minutes.
Toss red pepper in 1/2 tbsp olive oil, pinch of salt and black pepper
About 15 minutes into roasting, flip the sweet potatoes, eggplant and zucchini to roast evenly
After flipping, add red peppers in a single layer on the baking sheet with the sweet potatoes. Move the sweet potatoes around to create some room. Roast for 12 mins.
After 30 mins of roasting has passed, check on the vegetables to see if they are done. All vegetables should be pierced easily with a fork. If not done, keep roasting and check every 5 minutes or so
Once vegetables are done roasting, combine all of them in one sheet and cover it with the second sheet. This will steam the vegetables and release their juices