Salmon lasagna with spinach

Ingredients

• 25 ml olive oil
• 125 g yellow onion
• 300 g salmon
• 4 g cumin powder
• 4 g garlic powder
• 4 g onion powder
• 1 1/2 g black pepper powder
• 2 1/2 g salt
• 200 g fresh spinach
• lasagna sheets
• 50 g butter
• 30 g flour
• 550 ml milk
• 50 ml water
• 100 g cream cheese
• 75 g Parmesan cheese
• 5 g salt
• 0.1 black pepper