Pre-heat the oven to 375 degrees F.
Sauté the diced onions in the olive oil and a pinch of salt, over medium heat in a medium sized enameled Dutch oven. You are either going for delicate, soft, and translucent, or a little bit brown and caramelly, depending on the star ingredient. About 2 minutes before you think the onions will be ready, add the garlic and sauté another couple minutes.
Add the brown rice to the pot and stir to coat each grain with the aromatic infused oil.
Add the splash of wine to deglaze any fond that has developed and stir until the wine has mostly been absorbed by the rice.
If you are cooking in the star ingredient, add it now along with some broth. If there is a substantial amount of that ingredient, add 3 cups of broth. Otherwise, add 4 cups of broth.
Increase the heat to high and bring the pot to a full boil. As things are heating, taste test for seasoning. It should need some salt at this point, but how much depends on the how salty your selected broth is. At this point the broth should be well-seasoned. If your finishing cheese is a salty variety, such as an aged Parmesan, go for just under well-seasoned.
Once a full boil is reached, cover the pot and transfer to the 375 degree oven, where it will gently simmer for 50 minutes.
At this point you have plenty of time to prepare any mix-in ingredients, accompaniments, and garnishes.
After 50 minutes, remove the pot from the oven, open it and give it a quick stir. Expect the rice to be fully cooked and properly hydrated, but no residual liquid. Depending on many variables you may not find that to be true. If the rice is underhydrated (i.e. crunchy), it will take more time (and more liquid if there is no residual liquid at this point). If there is residual liquid, it just means that you will add less broth during finishing.
To finish, stir in the pats of butter then the mix-ins (if any), then 1 cup of broth. The cheese is stirred in last. Parmesan cheese can turn stringy if it is over-stirred, and risotto is all about creamy and should never be stringy! One last taste test for seasoning. Stir in a bit more salt only if it needs it.
Finally, plate, add garnishes and accompaniments, and enjoy!