Preheat the oven to 350 degrees F. Grease a 4-quart casserole dish and set aside.
Cook the bacon until crisp and roughly chop. Set aside.
Bring the broth, salt, pepper, and garlic powder to a boil in a sauce pan.
While whisking continuously, add the grits to the sauce pan. Whisk until the grits are completely combined. Reduce the heat to low and simmer until the grits have thickened.
Add the shredded gouda and cheddar, along with the milk, and stir. Gradually stir in the beaten eggs and butter until combined.
Add the chopped bacon and minced chives and mix until they are evenly distributed throughout.
Pour the grits into the prepared casserole dish, smoothing the top with a spatula. Sprinkle the remaining shredded cheese over the top. Bake for 30-40 minutes, or until the grits are set.
Allow the grits to cool for 15 minutes or so (or longer) to allow them to firm up a bit.