Preheat oven to 350 degrees F. Grease a casserole dish and set aside.
Place both bags of broccoli in microwave, instruction side up, and microwave for 6 minutes. Open bags and drain the broccoli in a strainer.
Place the broccoli and drained pimentos in a large bowl.
In a food processor, add the cottage cheese, mayonnaise, 1 1/2 cups of shredded sharp cheddar cheese, egg, lemon juice, salt and pepper. Pulse until smooth.
Pour the cheese mixture over the broccoli and pimentos. Stir until well combined. Spread evenly into the prepared casserole dish.
In a clean bowl, combine the crushed Ritz crackers with the melted butter. Stir until well combined.
Sprinkle the remaining 1/2 cup shredded cheddar cheese over the top of the broccoli casserole. Top the casserole with the buttered Ritz crackers.
Bake the casserole, uncovered, for 35 - 40 minutes. Serve immediately.