In a medium saucepan stir together grits, milk, chicken broth and salt . Bring to a boil over medium high heat, stirring often. Cover, reduce heat to medium low and simmer for 20 - 25 minutes, stirring occasionally.
While the grits cook, prepare a 12-cup muffin tin by brushing the cups with the reserved bacon fat. Set aside.
When the grits are done, remove from heat and stir in the butter, cheese and crumbled bacon. Taste and season with additional salt as needed. Spoon the grits into the prepared muffin tin and spread with the spoon to level the top.
Cover with foil and refrigerate for at least 2 hours, or until set.
Preheat oven to 425ยบ F. Lightly brush the tops of the grits cakes with the reserved bacon fat and bake for 30 minutes, until heated through and lightly browned.
Remove from oven, pop the grits cakes from the muffin tin and serve topped with chopped chives, shredded cheddar and crumbled bacon.