Step 1: In a medium saucepan, bring the water, milk, and salt to a gentle boil over medium-high heat.
Step 2: Slowly whisk in the grits, reduce the heat to low, and cover. Simmer for 15-20 minutes, stirring occasionally, until the grits are tender and creamy.
Step 3: While the grits cook, heat olive oil in a skillet over medium heat. Add the minced garlic and sauté for 1 minute until fragrant. Add the spinach and cook until just wilted, about 2-3 minutes. Remove from heat and set aside.
Step 4: Once the grits are done, stir in the butter and shredded cheddar cheese until completely melted and incorporated. Season with black pepper.
Step 5: In a separate non-stick skillet, melt a small knob of butter or use oil spray to fry the eggs to your preference (sunny-side up or over-easy recommended).
Step 6: Spoon a generous portion of cheesy grits into four bowls. Top each with a portion of the sautéed spinach and one fried egg. Garnish with red pepper flakes and serve immediately.