Preheat your oven to 350°F and line a large rimmed baking sheet with high-quality parchment paper.
Rinse the red lentils in a fine-mesh sieve until the water runs clear, then soak them in hot water for 15 minutes before draining thoroughly.
Transfer the soaked lentils to a high-speed blender along with the water, olive oil, nutritional yeast, rosemary, garlic powder, salt, and pepper.
Process on high until the batter is completely smooth and creamy with no visible lentil fragments.
Pour the batter onto the prepared baking sheet and use an offset spatula to spread it into an even, paper-thin rectangle.
Bake for 15 minutes, then remove from the oven and use a pizza cutter to score the dough into 2-inch squares.
Return the tray to the oven and bake for another 15 to 20 minutes until the crackers are golden brown and snap easily.
While the crackers finish, whisk the Greek yogurt, lemon juice, fresh dill, and the remaining salt and pepper in a small bowl to create the dip.
Let the crackers cool completely on the baking sheet to ensure they reach their maximum crispness before serving with the chilled yogurt dip.