Preheat oven to 350 degrees F.
In a large skillet, melt the butter and sauté the shallots over medium heat for around 3 minutes. Add the chopped red and yellow bell peppers and continue to sauté for 5 more minutes. Add the garlic and stir for 1 minute. Add the chopped spinach leaves in stages, turning over to wilt. Season vegetables with salt and pepper to taste. Remove from heat and allow to cool to room temperature.
Meanwhile, prepare pie shells by placing in pie plates and crimping edges.
Combine eggs, half and half, flour, nutmeg, and Tabasco in a large measuring cup. Whisk to combine. Add 1/2 teaspoon salt and a generous grind of black pepper and stir well.
Divide cooled spinach mixture between pie plates, spreading evenly.
Sprinkle crabmeat over spinach mixture, dividing evenly.
Sprinkle Colby Jack and Swiss cheeses over crabmeat evenly.
Whisk egg mixture one last time, then pour over ingredients in pie crusts, dividing evenly between the two pie plates.
Bake for 45-50 minutes, or until quiche is set and golden brown. (A table knife inserted into the center will come out clean.)
Remove from oven and allow to cool before serving.