Preheat your oven to 350°F (175°C). Line a baking tray with parchment paper. This prevents sticking and helps cookies bake evenly with a nice golden color.

In a large bowl, add softened butter and peanut butter. Beat them together until smooth and creamy. This step creates a rich base for soft and chewy cookies.

Add brown sugar and granulated sugar into the bowl. Mix well until light and fluffy. This helps give the cookies a soft texture and sweet flavor.

Crack eggs into the mixture one at a time. Mix slowly after each egg. Add vanilla extract and stir well. The batter should look smooth and creamy.

Add baking soda and salt into the bowl. Mix gently. Then add rolled oats and combine everything well. The dough will become thick and slightly sticky.

Fold in chocolate chips and candy-coated chocolates. Mix evenly so every cookie gets a good amount of toppings. This gives the cookies a fun look.

Use a cookie scoop or spoon to form dough balls. Place them on the baking tray. Leave space between each cookie as they spread while baking.

Bake in the preheated oven for 10–12 minutes. The edges should look golden. The center will stay soft. Do not overbake to keep them chewy.

Remove cookies from the oven. Let them cool on the tray for 5 minutes. Then transfer to a rack. Cooling helps them set properly and taste better.