Prep all ingredients as instructed above.
Heat olive oil in a skillet over medium heat. Sauté the green and red bell peppers and onion until tender and golden brown, about 7–10 minutes. Season with salt and black pepper.
Preheat a grill or grill pan over medium heat. Grill the sausage links until they develop a nice char on all sides and reach an internal temperature of 160°F (71°C) for safe consumption.
Place each grilled sausage in a prepared bun. Top with the sautéed peppers and onions, then add ketchup and yellow mustard as desired.
Warm the baked beans on the stovetop or in the microwave until hot.
Make the Peach Ginger Chia Fresca: combine all the ingredients together. Let sit for 5 minutes to allow the chia seeds to expand, then stir again.
Serve the grilled sausage with baked beans, watermelon slices, and peach ginger chia fresca. Enjoy!