Red and White Sauce Lasagna

Ingredients

• For the White Sauce:
• 4
  tablespoons of butter
• 2 ½
  cups milk (whole)
• ⅓
  cup all-purpose flour
• ½
  teaspoon kosher salt (or to taste)
• For the Red Sauce:
• 2
  tablespoons olive oil
• ½
  pound ground beef
• ½
  pound ground pork
• 1
  medium onion (chopped)
• 6
  to 8 white mushrooms (sliced)
• 3
  cloves garlic (chopped)
• 30
  -ounce cans tomato sauce
• 2
  teaspoons oregano (dried)
• 2
  teaspoons basil (dried)
• Kosher salt (to taste)
• Black pepper (to taste)
• For Assembling:
• 1
  package lasagna noodles (oven-ready)
• 2
  cups mozzarella cheese (shredded)
• ½
  cup Parmesan cheese (grated)