Halacha: What Blessing Do You Say Over Yogurt?

On the yogurt, you recite Shehakol (first blessing)

And at the end of eating, you recite Boreh Nefashot (final blessing)

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The quantity of eating required to be obligated in a final blessing (from Halacha Yomit, based on the rulings of Maran Rabbi Ovadia Yosef, of blessed memory):

For any food a person eats, they must recite the "first blessing" over it, such as the blessing "Shehakol" or "Ha'etz." Even if one only eats a little of that food, they are obligated to bless it, as long as they are eating it with the intent of consumption. (However, if the only intent is to taste the food in order to improve it by adding seasoning, etc., this is not considered an "eating" that requires a blessing.) Therefore, someone who chews flavored chewing gum, even if they swallow only a tiny bit of it, must nonetheless bless it for the enjoyment of its flavor. Similarly, if someone drinks something, they need to bless it even if they consume just a single drop.

However, this applies only regarding the first blessing. A final blessing is only recited when one consumes a significant portion of food, which is defined as the amount of a "kezayit," meaning twenty-seven grams. In terms of drinking, the amount is a "revi'it," which is eighty-one grams.

Additionally, the eating or drinking must occur within a specific period for the consumption to combine into the significant quantity. For if a person eats a kezayit of bread throughout an entire day, piece by piece, they certainly cannot recite the Birkat Hamazon afterward. The consumption of a kezayit must occur within the time span of "Achilat Pras." There is a dispute among poskim about the length of this time, with some saying it is five minutes and others stating it is about seven and a half minutes (and there are other opinions as well). Therefore, it's prudent to always consume a kezayit (especially during Shabbat meals) within four and a half minutes to fulfill all opinions.

And regarding the final blessing on a drink, one must drink a revi'it of the beverage (eighty-one grams) all at once. If one stops between sips, no final blessing is recited. Therefore, someone drinking soup with a spoon does not say a final blessing on the soup because they did not drink a revi'it at once. The same applies to someone drinking hot coffee or tea, who does not recite a final blessing, as they cannot consume it all at once.