To make the marinade, mix together the chipotle sauce, garlic, onion powder, tomato paste, red pepper flakes and broth. Place tempeh in a shallow dish along with the marinade and let sit for 2 hours, or overnight in the fridge.
Add 1 teaspoon of olive oil to a pan over medium heat, and cook the tempeh, turning frequently so that most of the sides brown. Add leftover marinade a spoonful at a time to the pan for the tempeh to absorb. Reserve a little marinade to cook the vegetables with.
After the tempeh cubes have absorbed most of the marinade, remove them from the pan and set aside.