Many small changes.

code/modules/food/food/condiment.dm

@@ -98,6 +98,21 @@
 				name = "Sugar"
 				desc = "Tastey space sugar!"
 				center_of_mass = list("x"=16, "y"=6)
+			if("peanutbutter")
+				name = "Peanut Butter"
+				desc = "A jar of smooth peanut butter."
+				icon_state = "peanutbutter"
+				center_of_mass = list("x"=16, "y"=6)
+			if("mayo")
+				name = "Mayonnaise"
+				desc = "A jar of mayonnaise!"
+				icon_state = "mayo"
+				center_of_mass = list("x"=16, "y"=6)
+			if("yeast")
+				name = "Yeast"
+				desc = "This is what you use to make bread fluffy."
+				icon_state = "yeast"
+				center_of_mass = list("x"=16, "y"=6)
 			else
 				name = "Misc Condiment Bottle"
 				if (reagents.reagent_list.len==1)
@@ -146,6 +161,10 @@
 	. = ..()
 	reagents.add_reagent("soysauce", 50)
 
+/obj/item/weapon/reagent_containers/food/condiment/yeast/Initialize()
+	. = ..()
+	reagents.add_reagent("yeast", 50)
+
 /obj/item/weapon/reagent_containers/food/condiment/small
 	possible_transfer_amounts = list(1,20)
 	amount_per_transfer_from_this = 1

code/modules/food/recipes_microwave.dm

@@ -611,7 +611,7 @@ I said no!
 	result = /obj/item/weapon/reagent_containers/food/snacks/monkeysdelight
 
 /datum/recipe/microwave/baguette
-	reagents = list("sodiumchloride" = 1, "blackpepper" = 1)
+	reagents = list("sodiumchloride" = 1, "blackpepper" = 1, "yeast" = 5)
 	items = list(
 		/obj/item/weapon/reagent_containers/food/snacks/dough,
 		/obj/item/weapon/reagent_containers/food/snacks/dough,
@@ -619,7 +619,7 @@ I said no!
 	result = /obj/item/weapon/reagent_containers/food/snacks/baguette
 
 /datum/recipe/microwave/croissant
-	reagents = list("sodiumchloride" = 1, "water" = 5, "milk" = 5)
+	reagents = list("sodiumchloride" = 1, "water" = 5, "milk" = 5, "yeast" = 5)
 	items = list(/obj/item/weapon/reagent_containers/food/snacks/dough)
 	result = /obj/item/weapon/reagent_containers/food/snacks/croissant
 
@@ -631,10 +631,8 @@ I said no!
 	result = /obj/item/weapon/reagent_containers/food/snacks/fishandchips
 
 /datum/recipe/microwave/bread
-	items = list(
-		/obj/item/weapon/reagent_containers/food/snacks/dough,
-		/obj/item/weapon/reagent_containers/food/snacks/egg
-	)
+	reagents = list("yeast" = 5)
+	items = list(/obj/item/weapon/reagent_containers/food/snacks/dough)
 	result = /obj/item/weapon/reagent_containers/food/snacks/sliceable/bread
 
 /datum/recipe/microwave/sandwich

code/modules/reagents/Chemistry-Reagents/Chemistry-Reagents-Food-Drinks.dm

@@ -128,6 +128,14 @@
 	nutriment_factor = 10
 	color = "#FFFFFF"
 
+/datum/reagent/nutriment/yeast
+	name = "Yeast"
+	id = "yeast"
+	description = "For making bread rise!"
+	taste_description = "yeast"
+	nutriment_factor = 1
+	color = "#D3AF70"
+
 /datum/reagent/nutriment/flour
 	name = "Flour"
 	id = "flour"