Heat a large skillet over medium heat and add 1 Tbsp olive oil.
Add the diced onion and minced garlic to the skillet and sauté until the onion is translucent and the garlic is fragrant, about 2–3 minutes.
Add the 1/2-inch sliced sausage links and cook until browned, turning once, about 4–5 minutes.
Add the sliced red, orange, and yellow bell peppers and the broccoli florets. Stir and cook until the vegetables are tender-crisp, about 4–6 minutes (cover the skillet for 2–3 minutes if you prefer softer broccoli).
Drain the 10 oz can of Rotel tomatoes and add them to the skillet along with 1 tsp Mrs. Dash onion and herb blend, 1/4 tsp red pepper flakes, and a pinch of sea salt. Stir to combine.
Cook everything together for an additional 3–5 minutes, until heated through and flavors are combined.
Remove from heat and serve hot.