One at a time, grasp the stems of the kale in one hand and strip the leaves off with the other. (keep the stems for another use such as a smoothie or soup).
Working in batches thinly slice the kale.
Chop onions, slice mushrooms, mince garlic.
Cut the carrots in half lengthwise, then slice on an angle to make half moons 1/8” thick
Heat the olive oil in a large sauté pan on medium low
Add onions and mushrooms. Sauté on medium until mushrooms are beginning to soften about 3 minutes.
Add carrots, sauté 2 minutes until carrots are almost tender.
Add garlic, stir and sauté 1 minute until garlic is fragrant.