I travel a lot for work, and this is my experience in and around Germany (even for small, family owned, 10 bedroom hotels):

• 3 kinds of bread rolls
• 2 types of bread to cut by yourself
• Also soft, crustless, white bread (aka toast)
• Butter and 3 kinds of cream cheese
• 4-10 types of cheese
• 4-8 types of cold cut meats
• 3 jams/jellies
• Honey
• Nutella
• Liver pâté
• Scrambled or boiled egg
• 1 type fried sausage
• 1-3 types of Müsli (cereal mix with oats and nuts or fruits)
• 2-3 types of box cereal (the sweet kind like fruit loops)
• Yoghurt plain and fruit-flavoured
• Quark dessert
• Canned fruit mix
• Fresh fruit
• Croissants or muffins or Madeleines
• optional waffles or pancakes

For drinks:

• Orange juice
• Multivitamin juice
• Coffee
• Hot water bar with 3-12 types of tea