Disclaimer:This is only what they seem to like/dislike, although I'm certain by their reactions that this isn't far from accurate.

Adam

• Favors: S'mores
  
• Likes: Dark Forest, Chocolate Peanutbutter, Fruit Smoothie, Birthday Cake, Gut Buster, The King
  
• Dislikes: Sunny Picnic, German Chocolate, Red Velvet, Valentine

Benito

• Favors: S'mores or anything with marshmallows
  
• Likes: Birthday Cake, Chocolate Peanutbutter, Gut Buster, Valentine, Red Velvet
  
• Dislikes: Anything with strawberries or fruit in general

John

• Favors: Dark Forest, Fruit Smoothie
  
• Likes: Sunny Picnic, Birthday Cake, German Chocolate
  
• Dislikes: S'mores, Gut Buster, The King, Valentine, Red Velvet

Matthew

• Favors: German Chocolate
  
• Likes: Sunny Picnic, S'mores, Birthday Cake, Dark Forest, Valentine, Red Velvet, Fruit Smoothie
  
• Dislikes: Chocolate Peanutbutter, The King, Gut Buster

Adam
Sunny Picnic "Hm, that sounds interesting. Thanks for making it for me!"
S'mores "S'mores? You mean my FAVORITE THING EVER? I'll eat a whole batch if you've got it!
Birthday Cake "I like the candle, though. Nice touch."
Dark Forest "I heard chocolate, strawberries, and something that sounded like a French word." (Sian explains what ganache is) "In that case, yes please."
Chocolate Peanutbutter "Always a good combination. Thank you."
Gut Buster "What's in it?" (Sian explains) "Whoa. Now this I've got to try."
German Chocolate "Oh! Um...thanks? It's just that I don't like the dried coconut stuff that much. It kind of pales in comparison with having it fresh."
Valentine "Thanks but I'm not a huge fan of red velvet."
Red Velvet "Thanks but I'm not a huge fan of red velvet."
The King "Huh. I wouldn't have thought of mixing those, but now that you say it out loud, it sounds kind of good. Thanks."
Fruit Smoothie "Nice! You know how much I love fresh fruit!"

Benito
Sunny Picnic "Um, this is kind of embarrassing, but strawberries kind of aren't my thing. The rest is pretty good though."
S'mores "I love s'mores!"
Birthday Cake "But it's got a candle and everything! Nice!"
Dark Forest "Oh! Um...strawberries aren't exactly my thing. Sorry. But the chocolate part is pretty good."
Chocolate Peanutbutter "Reminds me of the candy. Nice!"
Gut Buster "That's brilliant! This thing is amazing!"
German Chocolate "Huh. I've never tried this before. The applesauce works better than I'd expect."
Valentine "Mm...the marshmallows are the best part!"
Red Velvet "Ooh, this is good. Thanks!"
The King "Not bad! I'm not a huge fan of bananas, but the peanutbutter and bacon are perfect."
Fruit Smoothie "It's not bad, but the ingredients aren't exactly my favorite."

John
Sunny Picnic "A delightful combination. I will be sure to enjoy it."
S'mores "S'mores? That confection that small children make on camping expeditions? It's...interesting."
Birthday Cake "Sometimes the simple things are the best. Thank you."
Dark Forest "Did you make this ganache yourself? The texture is exquisite. Well done."
Chocolate Peanutbutter "An interesting combination. I'd not considered this before." (Sian asks if he likes it) "I'd have to think about it."
Gut Buster "Oh! This seems a little too rich for my tastes, but I appreciate the idea."
German Chocolate "You know these things aren't really from Germany right?"
Valentine "Red Velvet? Isn't this just plain cake with food dye? That doesn't seem healthy."
Red Velvet "Red Velvet? Isn't this just plain cake with food dye? That doesn't seem healthy."
The King "Well, this is certainly a unique combination."
Fruit Smoothie "It's very refreshing! I'm surprised you managed to infuse something so fresh into a baked good."

Matthew
Sunny Picnic "This is delicious! Thank you."
S'mores "Um...what is a s'mores?" (Sian explains the concept of s'mores) "It tastes good! Thank you."
Birthday Cake "Why is there a candle on it?" (Sian explains) "I like it."
Dark Forest "That sounds really good! It was nice of you to do this."
Chocolate Peanutbutter "Oh! I'm allergic to peanuts. I'm sorry..."
Gut Buster "I'm not sure that sounds like a good combination..."
German Chocolate "Oh! That's my favorite kind! Thank you!"
Valentine "I like it very much. The sweetness is nice. Thank you!"
Red Velvet "I remember having a cake like this once as a kid. I really liked it."
The King "I'm sorry, Sian, but I'm allergic to peanuts..."
Fruit Smoothie "This is really good! I like all the fruit you included! Thank you."

Also interesting to note is that you can give cupcakes to Nicole if you befriend her and get her number. She likes fruit smoothie. You can also befriend Alvin (teachers aide) and get his number, though the option to give him cupcakes is not available as far as I know.