Heat olive oil in a small skillet. Add shallot and cook for 2 minutes. Stir in spinach, 1/2 t. salt, 1/2 t. pepper and 1/8 t. nutmeg. Cook for about 5 minutes, until spinach is fully thawed. Cool.
Meanwhile, combine ground beef, bread crumbs, egg, salt, pepper, garlic powder and Italian seasoning in a large bowl. Mix together until fully incorporated.
Press ground beef mixture into a rectangle on a baking sheet or other easy-to-clean surface.
Layer cheese on top of ground beef, leaving about a 1/2 inch edge all around. Scoop cooled spinach mixture on top.
Roll up jelly-roll style, pressing together tightly as you roll.
Place on a broiler pan or on a cooling rack on top of a baking sheet. Bake at 375 degrees for 30-35 minutes, until fully cooked. Let sit 5 minutes before slicing.
You may notice that the roll did come apart a bit as it cooked. If I was really wanting a perfect presentation, I’d probably tie the roll with some twine to help it keep its shape while it baked. But for just our family, it was perfect. The kids were quite impressed though and happily dug right into what they dubbed a “very fancy” meal.