Creamy Pasta Bake "formula" - make this with ANYTHING!

Bahan-bahan (8 porsi)

• 500 g / 1lb pasta ((any short or long except risoni/orzo) (Note 1))
• 1 tbsp salt ((for water))
• 4 tbsp (60g) butter (, unsalted)
• 2 g arlic cloves (, minced (optional, sub 1 tsp powder))
• 5 tbsp flour (, any (GF option Note 2))
• 5 cups (1.25 litres) milk (, any fat, any type)
• 2 tsp stock / bouillon cube or powder (, chicken or veg)
• 3/4 cup (75g) parmesan
• 1/2 tsp black pepper
• 1 tsp EACH thyme and parsley (, or any other dried herbs)
• 1/2 tsp EACH mustard, garlic, onion powder
• 8 cups Add Ins - raw or cooked meats, bacon, ham, diced vegetabes (frozen, canned, fresh), canned or fresh fish ((Note 3))
• 1 tbsp olive oil
• Salt and pepper
• 2 cups (200g) cheese (, shredded (Note 4))