Preheat oven to 400°F (200°C). Toss sweet potato cubes with 1 tablespoon olive oil, salt, and pepper. Roast on a baking sheet for 20-25 minutes until tender. Set aside to cool.
Place lentils in a small pot with 3 cups of water. Bring to a boil, then reduce heat and simmer for 15-20 minutes until tender but not mushy. Drain and let cool completely.
In a medium bowl, combine chopped kale with 1 tablespoon olive oil and a pinch of salt. Massage the leaves with your hands for 2-3 minutes until they become dark green and tender.
In a small bowl, whisk together tahini, lemon juice, maple syrup, and minced garlic. Add water 1 tablespoon at a time until a pourable dressing consistency is achieved.
Gather four 32-ounce mason jars. Divide the tahini dressing equally among the bottoms of the four jars.
Layer the ingredients into each jar in the following order: cooled lentils, roasted sweet potatoes, massaged kale, pumpkin seeds, and dried cranberries.
Seal the jars tightly and refrigerate. When ready to eat, shake the jar vigorously to distribute the dressing or pour into a bowl and toss.