Preheat oven to 375 degrees.
In a great big bowl, add the peaches, 1/4 cup sugar, lemon juice and cinnamon. I like a lot of cinnamon and so I will add 1 whole teaspoon. But 1/2 tsp. is just fine. Toss to coat
Pour filling into a 9x13 pan and spread evenly. Make sure you scrape all the juices out.
In the same large bowl, add the flour, oats, sugars, cinnamon, nutmeg and salt. Stir until combined. Now add the cut up butter. You can use your fingers or forks to work the butter into the dry mixture until the butter becomes crumbly and small pieces.
Pour the topping onto the peaches. Spread evenly. Bake 40 minutes.
Allow to cool for 30-60 minutes. Add vanilla ice cream, whipped cream or eat it for breakfast! It's all good!