Slice butter into large chunks and place in a 9×13 pan.  Place pan in oven and preheat to 400 degrees. (Keep an eye on this if you get delayed in the following steps so your butter doesn't burn!)

Whisk together flour, baking powder and salt in a large mixing bowl.  Add 1-2 eggs and whisk mixture until there are no lumps.  Add in remaining eggs and whisk until smooth.  Stir in green chiles, cottage cheese, and jack cheese and stir until just combined.

Remove pan from oven and tilt pan so the butter coats all over then carefully pour butter into egg mixture and stir to combine.  Pour mixture back into warm pan.

When oven is preheated place pan in oven and cook for 15 minutes.  Reduce heat to 350 and cook for an additional 35-40 minutes, or until top is golden and slightly browned.  Let cool for 10 minutes before slicing into squares and serve.