Roast the sweet potatoes: Preheat your oven to 400 degrees. Chop the sweet potato into bite-sized cubes. Drizzle with some olive oil, sprinkle with salt and pepper, and roast in the oven for 20-30 minutes, or until the edges start to turn darker and roasty. (In the photo I have some sage on my baking sheet, you can roast your sage so it gets a little crispy, but take it off before the sweet potatoes are done).
Make the dressing: In a small bowl, whisk together the olive oil, garlic, honey, apple cider vinegar, cinnamon, sage, salt, and pepper. Taste and adjust seasonings, and set aside.
Place the greens in a large bowl. Toss the warm wheat berries and hot sweet potatoes over them so they wilt slightly from the heat. Add the dressing, as much or little as you like. Toss.
Add the cranberries, feta, pumpkin seeds, and a pinch of red pepper flakes. Gently toss again. Taste and adjust seasonings, and serve.