Sometimes with treasure inside and sometimes without.
Sometimes written with initials, but sometimes spelled out.
Sometimes small and colorful and sometimes large and white.
Sometimes you don't want to eat me, but sometimes you might.
Sometimes I can be found in a pantry on a shelf, but if not you just might lose yourself.
What am I?
Are you
M&M/Eminem?
Sometimes with treasure inside and sometimes without.
Peanut M&M's have "treasure inside" but Eminem the rapper does not.
Sometimes written with initials, but sometimes spelled out.
M&M is witten with initials, Eminem is spelt out.
Sometimes small and colorful and sometimes large and white.
M&Ms are small and colourful, but Eminem is tall and has white skin.
Sometimes you don't want to eat me, but sometimes you might.
People don't want to eat Eminem, but they might want to eat M&Ms
Sometimes I can be found in a pantry on a shelf, but if not you just might lose yourself.
M&Ms can be found on a shelf, and Lose Yourself is a song by Eminem
Title:
Sometimes sweet, but sometimes not so much
M&Ms are sweet, but Eminem is not so much...
Another Answer
Kisses
Sometimes sweet, but sometimes not so much
Chocolate Kisses or Just Kisses
Sometimes with treasure inside and sometimes without.
Stuffed chocolate Kisses or just Kisses
Sometimes written with initials, but sometimes spelled out.
Brand written with initial or spelled Kisses
Sometimes small and colorful and sometimes large and white.
small colored chocolate kisses or Large white kissing ball
Sometimes you don't want to eat me, but sometimes you might.
You don't want to eat chocolate kisses and sometimes you kiss
Sometimes I can be found in a pantry on a shelf, but if not you just might lose yourself.
Boxes on shelf (chocolate kisses pantry) or you lose yourself in kissing
Answer
Chocolate
Sometimes sweet, but sometimes not so much
Milk chocolate or Bitter chocolate
Sometimes with treasure inside and sometimes without.
Stuffed chocolate or just plain
Sometimes written with initials, but sometimes spelled out.
Brand written with initial or spelled
Sometimes small and colorful and sometimes large and white.
small colored chocolate or Large white bar chocolate
Sometimes you don't want to eat me, but sometimes you might.
You are on diet or diabetic and sometimes you need chocolate
Sometimes I can be found in a pantry on a shelf, but if not you just might lose yourself.
Boxes on shelf (chocolate pantry) or you lose yourself in chocolate
Are you
A Marble?
Sometimes with treasure inside and sometimes without.
I believe there are Geodes made of marble
Sometimes written with initials, but sometimes spelled out.
Could be referring to monograms
Sometimes small and colorful and sometimes large and white.
Small colorful marbles are usually glass, but marble is also a white stone, often large and carved.
Sometimes you don't want to eat me, but sometimes you might.
Marbling of meat is a delicious distribution of fat
Sometimes I can be found in a pantry on a shelf, but if not you just might lose yourself.
losing ones marbles is an idiom for losing one's mind
The title could be referring to
Marble Cake
Are you
Medication?
Sometimes sweet, but sometimes not so much.
Some medication is sugar-coated, and there also exist sugar pills.
Sometimes with treasure inside and sometimes without.
A bit foggy on this one--perhaps this refers to pills with a casing, where the medication is on the inside?
Sometimes written with initials, but sometimes spelled out.
Tablets generally have some initials or the name of the drug on them.
Sometimes small and colorful and sometimes large and white.
Medication comes in many different colors and shapes, and are often white.
Sometimes you don't want to eat me, but sometimes you might.
Kids (and sometimes adults) generally find taking medication to be a chore, but sometimes you really need an aspirin.
Sometimes I can be found in a pantry on a shelf, but if not you just might lose yourself.
Some people store their medication in the pantry, and if you lose medication for a serious disease, that could be dangerous (mentally or physically).
