3tablespoonsbutter, plus more to grease a 9x12 pan
1onion, chopped
1teaspoonminced garlic (or 2 cloves, minced)
2lbs.frozen spinach, thawed and thoroughly dried (this step is essential)
1 6ozbag fresh spinach, chopped
2cupsheavy cream
1cuphalf and half
1/4tspnutmeg
1tspsalt, plus more for extra seasoning
1/2tsppepper
1tablespoonDijon mustard
2cupsgrated Gruyère cheese
Topping:
1/2cupgrated Gruyère cheese
1/2cupalmond meal/almond flour
1/2tspsalt
Instructions
Preheat the oven to 400 degrees. Heat the butter on medium high heat in a wide, flat sauté pan and cook the onions until soft, about 7-9 minutes. Add the garlic, cook an additional 1-2 minutes.
Whisk in the cream and half and half, nutmeg, Dijon mustard, salt, and pepper, bring to boil then reduce the heat to medium low to simmer for 10 minutes, whisking every few minutes to make sure there is no sticking.
Fold in the chopped fresh spinach, cook 2-3 minutes until wilted. Add in one more dash of salt and pepper. Fold in the frozen spinach, cook for 2-3 minutes. Remove the pan from the heat and fold in 2 cups of the grated Gruyère until melted.
Pour the mixture into a well-greased 9x12 baking pan. Mix together the topping ingredients in a small bowl, then evenly top the spinach with the topping. Bake 20-30 minutes or until browned on top and bubbling.