Preheat your oven to 410 °F and line 1-2 baking sheets with silicone baking mats,parchment paper or alternatively, spray them with cooking spray. Whether you use one or two sheet pans depends on the size of your oven and how crispy you want your chickpeas and veggies.
Drain and rinse your chickpeas. Pour them into a clean tea towel and pat them dry. The dryer they are the crispier they will be after baking.
Place the dried chickpeas into a bowl and drizzle with 1 teaspoon of olive oil and ½ teaspoon each of sea salt and cumin. Stir everything together. Pour the chickpeas onto your sheet pan and spread them out into a single layer.
In a large mixing bowl, or directly on your sheet pan, drizzle the broccoli, cabbage and onion with olive oil and sprinkle over the fresh garlic and sea salt. I like to keep the broccoli and cabbage separate incase they cook at different rates. Spread the veggies out into a single layer on the sheet pan with the chickpeas or a second sheet pan.
Roast the chickpea and veggies for 15 minutes. Toss everything separately and return the pans to the oven to bake for another 10-20 minutes or until everything is cooked through and the chickpeas are crispy.
Be sure to watch everything towards the end as the baking times may vary.
This sheet pan dinner only covers veggies and a plant-based protein source, so you'll need to think through what else to serve with the veggies and chickpeas. I like to add a grain and a sauce or hummus.