Melt butter and white chocolate in a large sauce pot over low-medium heat. Stir often and make sure chocolate doesn't burn or scorch. Remove from heat.
Add rest of ingredients and stir to combine.
Preheat oven to 350 °F. Grease a 8x8 baking dish.
Pour batter in baking dish and bake uncovered for 20-30 minutes or until toothpick comes out clean.