Beat eggs lightly in large bowl. Stir in flour and baking powder. Add the 1/4 cup melted butter, chilies, and cottage cheese.
Saute onion in the 1 Tbsp butter; add to mixture along with cheese. Combine just until blended.
Pour mixture into greased 9x9-inch baking dish or pie plate and bake at 400 deg F for 15 minutes. Reduce heat to 350 deg F and continue baking about 30 minutes.
Cut into small squares or wedges and serve hot.