Whisk eggs, milk, and spices together in a large bowl. Set aside
Line a casserole dish with parchment paper or spray with non-stick spray.
Pour spinach, bell pepper, and feta in egg mixture. Stir until evenly mixed in.
Pour casserole mixture into lined dish.
Cook casserole in oven 35-40 minutes at 325 F until toothpick comes out clean.
In a cold cast iron skillet, lay out bacon slices and bring to medium high heat cooking each side 2-3 min, until desired crispness. Remove bacon and place on a place. Do NOT pour out bacon fat.
In the same skillet, put potato halves in and toss with bacon fat on medium-high heat. Stirring occasionally, cook about 7-8 minutes until potatoes are golden brown on outside.
Remove casserole from oven, lay cooked bacon on top.
Cut into squares and serve with potatoes.
Notes
If you don't have egg whites or milk, just substitute for more eggs i.e. use 10 eggs instead of 8.