Step 1

Combine vegetable broth, onion, garlic, chipotle pepper, adobo sauce, 1/4 teaspoon salt, and 1/4 teaspoon black pepper in a large skillet. Bring to a boil over medium-high heat. Reduce heat to medium; simmer until onion is soft and translucent, about 5 minutes.

Step 2

Stir in kale. Cook, covered tightly and stirring occasionally, until just tender, 8 to 10 minutes. Season with more salt, black pepper, and crushed red pepper to taste.