Preheat oven to 350 F degrees.
Bring a large pot filled with water and a pinch of salt to a boil. Add broccoli and cook for a few minutes or until fork tender.
Meanwhile, create an ice bath in a seperate bowl by filling a large bowl with ice water.
Once the broccoli is al dente, remove it from the boiling water and shock it in the ice water to preserve color and texture. Strain and set aside.
In a seperate large bowl, add Athenos feta crumbles, cheddar soup, fried onion bits, sour cream, all purpose seasoning and stir.
Then add steamed broccoli and milk and stir again. Taste and season with salt if needed before setting aside.
Pour the broccoli cheese mixture into a greased casserole dish and set aside.
In a separate small bowl, combine the melted butter with the crushed crackers and stir.
Pour the buttery cracker crumble over the cheesy broccoli mixture and pat down to create an even surface.
Bake for 45 minutes or until hot and bubbly. Remove and serve immediately.