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1
Preheat oven to 400u00b0F Coat an 8-inch-square baking dish with cooking spray.
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2
Place bacon (if using) in a large Dutch oven. Cook over medium heat, stirring often, until crispy, 4 to 6 minutes. Remove with a slotted spoon to a paper towel-lined plate to drain. Pour off the bacon fat.
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3
Return the pot to medium-low heat; add oil, onion, and garlic and cook, stirring often, until fragrant and starting to brown in spots, 2 to 8 minutes (cooking time will be quicker if you started with bacon). Add 1 cup broth and salt; bring to a boil over high heat. Add collards (or kale); stir until wilted down to about one-third the volume and bright green, 1 to 2 minutes. Cover, reduce heat to medium-low, and simmer, stirring occasionally, until tender, 18 to 20 minutes. Adjust heat during cooking to maintain a simmer, and add water, 1/4 cup at a time, if the pan seems dry.
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4
Meanwhile, bring 2 cups water and the remaining 1 cup broth to a boil in a large saucepan. Pour in grits in a steady stream, whisking constantly. Bring to a simmer, whisking constantly. Reduce heat to medium-low and cook, whisking often, until thick, about 5 minutes. Combine 1/2 cup cheese, salsa, and egg in a small bowl. Remove the grits from the heat and quickly stir in the cheese mixture until combined.
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5
Working quickly, spread about half the grits in the prepared baking dish. Top with greens, spreading evenly. Spread the remaining grits over the greens. Sprinkle with the remaining 1/4 cup cheese and the reserved bacon (if using).
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6
Bake the casserole until hot and bubbling, about 20 minutes. Let stand for about 10 minutes before serving.
