Step 1

Set oven rack about 6 inches from the heat source and preheat the oven's broiler.

Step 2

Cook and stir bacon in a large oven-proof skillet over medium heat until evenly browned and crispy, about 10 minutes. Drain all but 1 teaspoon bacon grease from the skillet.

Step 3

Stir potato slices, water, garlic, red pepper flakes, salt, and black pepper into bacon; cover the skillet with a lid and cook until potatoes are tender, about 10 minutes.

Step 4

Mix Swiss chard into potato mixture; cook and stir until chard is slightly wilted, 2 to 3 minutes.

Step 5

Pour eggs over potato-chard mixture, stir gently, and remove skillet from heat. Top egg mixture with Parmesan cheese.

Step 6

Broil in the preheated oven until eggs are set and frittata is golden brown around the edges, 3 to 4 minutes.