Brown mushrooms can be found in shady areas in Minecraft worlds.
They can also be generated randomly in chunks with a 1/8 (12.5%) chance for red mushrooms and 1/4 (25.0%) chance for brown mushrooms.
Bone meal can be used to grow huge mushrooms, which can give at least 20 mushrooms when harvested.
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Mushrooms naturally generate in poorly lit areas ( light level of 12 or less). If this condition is met, each chunk has 1 ⁄ 8 (12.5%) chance to generate red mushroom and 1 ⁄ 4 (25.0%) chance to generate brown mushroom, in the form of random patches
Mushroom – Minecraft Wiki
Using bone meal on either a red or brown mushroom causes a huge mushroom to grow if enough room is available, and if the mushroom is planted on the appropriate block . Huge mushrooms can give at least 20 mushrooms when harvested.
Tutorials/Mushroom farming – Minecraft Wiki
What Recipies Can Mushrooms Create in Minecraft. Mushroom Stew (restores 6 hunger) - Red Mushroom + Brown Mushroom + Bowl. Rabbit Stew (restores 10 hunger) - Cooked Rabbit + Carrot…
Minecraft: How to Grow Mushrooms - Game Rant