Ingredients

• 1 tablespoon olive oil
  
• 6 ounces chorizo sausage, cut in 1/4" slices
  
• 1 medium onion, chopped
  
• 1 ¹/₂ cups whole milk
  
• 1 cup heavy cream
  
• 1 cup shucked oysters (about 12), liquor drained and reserved
  
• 3 cups spinach leaves, washed
  
• 1 teaspoon salt, or to taste
  
• 1 teaspoon freshly ground black pepper, or to taste