Cook the pasta: Boil in well-salted water until al dente. Drain and rinse briefly under cool water to stop cooking. Shake off excess water.
Prep the veggies: Halve cherry tomatoes, dice cucumber and bell pepper, slice a little red onion thinly, and roughly chop greens if using.
Blend the dressing: In a blender or food processor, combine cottage cheese, Greek yogurt (if using), olive oil, lemon zest and juice, Dijon, garlic, 1/2 teaspoon salt, and several grinds of pepper.
Blend until very smooth and creamy.
Taste and adjust: Add more lemon for brightness, olive oil for silkiness, or salt and pepper to your liking. If too thick, splash in 1–2 tablespoons cold water.
Toss it together: In a large bowl, combine cooled pasta, veggies, and herbs. Pour on the dressing and toss until everything is coated.
Add extras: Fold in your protein of choice and a small handful of grated Parmesan or crumbled feta if you like.
Finish with red pepper flakes.
Chill or serve: It’s great right away, but 20–30 minutes in the fridge helps the flavors meld. Give it a quick stir before serving.