Speedy Beef Spinach Lasagna RollUps Reinvented Comfort

Ingredients

• 1 tbsp olive oil (15 ml)
• 1 medium onion, finely chopped (about 1 cup / 150g)
• 2 cloves garlic, minced
• 500g / 1.1 lbs beef mince (ground beef)
• 1 (400g / 14 oz) can crushed tomatoes
• 1 (400g / 14 oz) can tomato sauce
• 100g / 3.5 oz fresh spinach, roughly chopped
• 1 tbsp dried oregano
• 1/2 tsp red pepper flakes (optional, for a bit of a kick)
• Salt and black pepper, to taste
• 400g / 14 oz full-fat ricotta cheese
• 1 large egg, lightly beaten
• 50g / 1/2 cup grated Parmesan cheese
• 1/4 tsp ground nutmeg
• 9 dried lasagna sheets (the kind that don't need pre-boiling)
• 100g / 1 cup grated mozzarella cheese