1. Prepare the Sweet Potatoes: Begin by peeling the sweet potatoes and cutting them into 1-inch cubes. Place the cubed sweet potatoes in a large pot and cover them with cold water by about an inch. Add a pinch of salt to the water.

2. Boil Until Tender: Bring the water to a boil over medium-high heat. Once boiling, reduce the heat to medium and simmer for 15-20 minutes, or until the sweet potato cubes are very tender when pierced with a fork.

3. Drain Thoroughly: Carefully drain the cooked sweet potatoes in a colander. Let them sit in the colander for a minute or two to allow any excess steam to escape.

4. Mash the Sweet Potatoes: Return the drained sweet potatoes to the empty pot. Add the unsalted butter and milk. Using a potato masher or a large fork, mash the sweet potatoes until they are mostly smooth.

5. Incorporate Cottage Cheese and Seasonings: Add the cottage cheese, garlic powder, onion powder, black pepper, and salt to the mashed sweet potatoes.

6. Mix Until Smooth and Creamy: Stir everything together vigorously until the cottage cheese is fully incorporated and the mixture is smooth and creamy. Taste and adjust the seasoning as needed, adding more salt or pepper if desired.

7. Serve Warm: Transfer the savory sweet potato spread to a serving bowl. If using, garnish with fresh chives or parsley. Serve immediately while warm.